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shivani	Sep 14 2005, 11:47 PM Post #1
Dedicated Member Group: Members Posts: 3886 Joined: 1-August 05 Member No.: 2848	1. Guess the next number 77 58 49 45 29 27 23

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shivani	Sep 15 2005, 02:34 PM Post #2
Dedicated Member Group: Members Posts: 3886 Joined: 1-August 05 Member No.: 2848	chalo vivek aapke liye ek aur sahi : ) 4. There are 100 closed doors. 1st person who comes, opens all doors. 2nd person changes the current state of every 2nd door (opens closed door and closes open door). 3rd person changes state of every 3rd door, starting from 3rd door. This continues till 100th person. Finally how many doors are open and how many closed..

vivekpm	Sep 15 2005, 03:05 PM Post #3
Dedicated Member Group: Members Posts: 1404 Joined: 22-November 03 Member No.: 120	QUOTE(shivani @ Sep 15 2005, 02:34 PM) chalo vivek aapke liye ek aur sahi : ) 4. There are 100 closed doors. 1st person who comes, opens all doors. 2nd person changes the current state of every 2nd door (opens closed door and closes open door). 3rd person changes state of every 3rd door, starting from 3rd door. This continues till 100th person. Finally how many doors are open and how many closed.. Seems you are determined to get me fired from my job Writing a small program gave me "10" as answer (open doors). I will get back with the logic soon. Obviously door which has been touched odd number of times remains open. Will have to find out what are the special properties of 10 such numbers between 1 and 100. Will be back. Cheers, V i V e K ... -------------------------------------------- Education is a progressive discovery of our own ignorance. -- Will Durant

vivekpm	Sep 15 2005, 04:26 PM Post #4
Dedicated Member Group: Members Posts: 1404 Joined: 22-November 03 Member No.: 120	QUOTE(vivekpm @ Sep 15 2005, 03:05 PM) QUOTE(shivani @ Sep 15 2005, 02:34 PM) chalo vivek aapke liye ek aur sahi : ) 4. There are 100 closed doors. 1st person who comes, opens all doors. 2nd person changes the current state of every 2nd door (opens closed door and closes open door). 3rd person changes state of every 3rd door, starting from 3rd door. This continues till 100th person. Finally how many doors are open and how many closed.. Seems you are determined to get me fired from my job Writing a small program gave me "10" as answer (open doors). I will get back with the logic soon. Obviously door which has been touched odd number of times remains open. Will have to find out what are the special properties of 10 such numbers between 1 and 100. Will be back. Cheers, Just learnt that only perfect squares can have odd number of divisors. This is because all other numbers can only have pair of divisors. Take for example, 12, it has three pairs of divisors, "2, 6", "1, 12" and "4,3". Only perfect squares can have odd number of divisors because its square-root cannot pair up with any other number. Take for example 49, its divisors are "1, 49" and "7". And since there are 10 perfect squares between 1 and 100, there will be 10 doors open. Interesting concept. Learnt a new thing about perfect squares today Cheers, V i V e K ... -------------------------------------------- Education is a progressive discovery of our own ignorance. -- Will Durant

Posts in this topic

shivani Riddles Sep 14 2005, 11:47 PM

shivani ok! a clue.. only need to look at the current ... Sep 15 2005, 10:15 AM

vivekpm Ok... I think I have got it. But I cannot help but... Sep 15 2005, 11:07 AM

shivani sweet Vivek : ) .. I took a whole day to crack it ... Sep 15 2005, 11:11 AM

vivekpm Will have to admit that your clue helped. Had I... Sep 15 2005, 11:34 AM

vivekpm Thought over this during lunch and here is how I w... Sep 15 2005, 01:58 PM

visuja Brilliant Vivek :clap1: Excellent solutions to bot... Sep 15 2005, 02:03 PM

shivani :) Vivekahh.. Korrect again.. and you get another ... Sep 15 2005, 02:20 PM

vivekpm Thanks Shivani (and thanks Vivek for the complim... Sep 15 2005, 02:30 PM

shivani chalo vivek aapke liye ek aur sahi : ) 4. There ar... Sep 15 2005, 02:34 PM

vivekpm Seems you are determined to get me fired from my... Sep 15 2005, 03:05 PM

vivekpm Seems you are determined to get me fired from my... Sep 15 2005, 04:26 PM

visuja maybe im making an assumption here, but its not ve... Sep 15 2005, 02:40 PM

shivani Korrect Visu baba Sep 15 2005, 02:59 PM

shivani ayoooo Vivekah.. am getting slightly scared of u ... Sep 15 2005, 06:02 PM

vivekpm Though I would very much love to be one, but I a... Sep 15 2005, 06:18 PM

Mandrake VIVEK(PM), YOU ARE NOT TOO GOOD... YOU ARE BRI... Sep 15 2005, 08:41 PM

vivekpm Mandrake, aap khamokha itni taarif kar rahe ho :... Sep 15 2005, 11:45 PM

shivani mmmm Vivek : ) since you are on roll.. another one... Sep 15 2005, 09:51 PM

divyanjali Vivek u r damn brilliant in maths....... :bow: ... Sep 15 2005, 10:05 PM

vivekpm This reminds me of another problem, a man walks ... Sep 15 2005, 11:52 PM

shivani well.. mathematical Question hi hai Divvy :) and m... Sep 15 2005, 10:13 PM

shivani well you answered it again Vivekahh :blab: It is ... Sep 15 2005, 11:56 PM

vivekpm I am running away!!! :bye: :bye: ... Sep 16 2005, 12:01 AM

visuja Good ones, Shivani .. kahaan se copy-paste kar rah... Sep 16 2005, 06:22 AM

divyanjali shiv.. kahan ho .. more riddles please......... i ... Sep 16 2005, 03:02 PM

vivekpm Ok Divyanjali... let me try. Maine kaha tha naa,... Sep 16 2005, 03:24 PM

divyanjali Ok Divyanjali... let me try. Maine kaha tha naa,... Sep 16 2005, 03:58 PM

Mandrake Monsieur Vivekulus, vous etes tres amazant!... Sep 16 2005, 03:34 PM

vivekpm JaadugarJi... What does this mean :blab: ??? Mo... Sep 16 2005, 03:53 PM

Mandrake JaadugarJi... What does this mean :blab: ??? Mo... Sep 16 2005, 04:16 PM

vivekpm JaadugarJi... What does this mean :blab: ??? Mo... Sep 16 2005, 04:40 PM

divyanjali JaadugarJi... What does this mean :blab: ??? Mo... Sep 16 2005, 04:46 PM

shivani mmm too much work today Divvy.. but here is the ne... Sep 16 2005, 04:47 PM

divyanjali oh no.......... Probability.......... :huh: bah... Sep 16 2005, 07:44 PM

Mandrake :lol: Shivani, kya sawaal poochha hai :rollf: C... Sep 16 2005, 05:19 PM

vivekpm Shivani, a doubt. If C starts and misses, does B ... Sep 16 2005, 05:42 PM

shivani Vivek.. am sorry I have not started workign on thi... Sep 16 2005, 06:10 PM

vivekpm Okie... Will wait for your inputs. Have forgotte... Sep 16 2005, 06:17 PM

shivani Okie... Will wait for your inputs. Have forgotten ... Sep 16 2005, 06:22 PM

shivani clue.... C can chose to shoot anyone/anywhere.. a... Sep 17 2005, 12:23 AM

vivekpm Yeah I assumed that. I have kind of come up with... Sep 17 2005, 12:58 AM

shivani :rollf: if uve given uo.. answer batayen Sep 17 2005, 01:02 AM

vivekpm Ok bata dijiye if no one else is trying... But I... Sep 17 2005, 01:08 AM

shivani grrr.... that is right C should take first aim in ... Sep 17 2005, 01:27 AM

vivekpm Me not reading this one now... Want to sleep tig... Sep 17 2005, 01:33 AM

shivani Par ShivaniJi, maine apne pehle post pe bhi to k... Sep 17 2005, 09:49 AM

Mandrake Sorry fellas, I am not happy with that solution. Y... Sep 17 2005, 07:49 AM

shivani mmm.. When it is A's turn he can and will sho... Sep 17 2005, 09:37 AM

Mandrake :lol: So C depends of B's 50:50 chance of kill... Sep 17 2005, 09:48 AM

shivani Self dependence doesnt mena that one stops think... Sep 17 2005, 09:50 AM

Mandrake Forgotten the fifth one? Rrrrrreally poor memory.... Sep 17 2005, 09:53 AM

shivani nahi hai? why have I always lived with the idea th... Sep 17 2005, 10:15 AM

Mandrake Woh kya hai na, ki hamaare dimensions mein to 4 hi... Sep 17 2005, 10:35 AM

shivani Vivekaahh... or anyone else!! no attempts ... Sep 20 2005, 05:24 PM

vivekpm Vivekaahh... or anyone else!! no attempts... Sep 20 2005, 09:51 PM

vivekpm There are three scenarios to consider here: [*]Per... Sep 22 2005, 12:12 AM

vivekpm Kya Hua? Galat Jawab? :unsure: Ok... since you a... Sep 24 2005, 11:47 PM

divyanjali Kya Hua? Galat Jawab? :unsure: Ok... since you ... Sep 25 2005, 01:13 AM

vivekpm Kya Hua? Galat Jawab? :unsure: Ok... since you... Sep 25 2005, 01:27 AM

vivekpm No attempts? Ok... Hint: Think BODMAS, think brack... Sep 25 2005, 05:44 PM

divyanjali No attempts? Ok... Hint: Think BODMAS, think brac... Sep 25 2005, 06:09 PM

Mandrake Are you supposed to use 7 and 3 only 2 times each?... Sep 25 2005, 06:06 PM

Mandrake Jab tak koi aur try nahi karta tab tak try karne m... Sep 25 2005, 06:21 PM

vivekpm Jab tak koi aur try nahi karta tab tak try karne ... Sep 25 2005, 11:12 PM

Bhirgu OK Mandrake , Vivek and all the other bright mathe... Sep 25 2005, 06:49 PM

Mandrake Anil, the mathematical answer would be still zero,... Sep 25 2005, 07:16 PM

Bhirgu Mandrake, zero is correct bhai. I think it boils d... Sep 25 2005, 07:23 PM

Mandrake Mandrake, zero is correct bhai. I think it boils ... Sep 25 2005, 07:35 PM

divyanjali Jab tak koi aur try nahi karta tab tak try karne ... Sep 25 2005, 07:25 PM

Bhirgu Divyanjali I dont think it will make any diff... Sep 25 2005, 07:32 PM

divyanjali Divyanjali I dont think it will make any dif... Sep 25 2005, 07:51 PM

Bhirgu True. Temperature goes in the minus. Sep 25 2005, 07:47 PM

Mandrake Ok, perhaps the wrong place to ask the most obviou... Sep 25 2005, 07:52 PM

divyanjali Ok, perhaps the wrong place to ask the most obvio... Sep 25 2005, 08:03 PM

Bhirgu They probably go down to the bottom where water do... Sep 25 2005, 08:07 PM

vivekpm No one attempting? Answer post kar doon? With th... Sep 26 2005, 11:10 PM

divyanjali arey yaar attempted.. tried all fractions and sums... Sep 27 2005, 01:54 PM

vivekpm arey yaar attempted.. tried all fractions and sum... Sep 27 2005, 02:03 PM

Mandrake Yes Vivek, me too give up :(( Sep 27 2005, 02:13 PM

vivekpm How about 7*(3+3/7)? Aur ek question. What is the... Sep 27 2005, 02:44 PM

shivani grrr.. mera wait kyun nahi kiya vivek.. i had solv... Sep 27 2005, 02:48 PM

vivekpm grrr.. mera wait kyun nahi kiya vivek.. i had sol... Sep 27 2005, 02:51 PM

shivani well you have put a simple AP there Vivek.. and is... Sep 27 2005, 03:19 PM

vivekpm well you have put a simple AP there Vivek.. and i... Sep 27 2005, 03:28 PM

shivani mazaak karte ho vivek.. maths and simple both ca... Sep 27 2005, 03:48 PM

divyanjali hmm shivani the other way can be... if u have for... Sep 27 2005, 06:25 PM

vivekpm Divyanjali, You got it correct. :clap1: Yes th... Sep 27 2005, 07:41 PM

hits And see, isn't Maths simple? Its all about p... Sep 29 2005, 03:22 AM

shivani I did apply.. but thoda different.. in steps of 11... Sep 27 2005, 07:45 PM

vivekpm I did apply.. but thoda different.. in steps of 1... Sep 29 2005, 12:00 AM

Mandrake Yaar tum sab log rrreally great ho :clap1: :clap1:... Sep 29 2005, 11:52 AM

divyanjali Yaar tum sab log rrreally great ho :clap1: :clap... Sep 29 2005, 02:05 PM

shivani MJ .. aap to rehne hi dijiye.. dont tease us with ... Sep 29 2005, 02:41 PM

Mandrake Arrey, bahooooooot hee asaaan sa sawaal poochha re... Sep 29 2005, 02:58 PM

Nimii Better still stop wearing shirts ;) Sallu khan ki ... Sep 29 2005, 03:01 PM

shivani :spank: halwa nahi hai dhang se solve karo Sep 29 2005, 03:02 PM

Nimii Zzzz ab tum kis ko peet rahi ho?? Mandrake ko :lol... Sep 29 2005, 03:05 PM

Mandrake Bechaari Nimmo!! :( Woh nahi jaanti ki Ni... Sep 29 2005, 03:16 PM

Nimii :angry: :abuse: Nimii takes our her trustedmember... Sep 29 2005, 03:24 PM

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