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Logic Challenge
Shidoshi
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#1
2010-11-11, 01:17 PM
Assume you have 1 million doors, they are all closed.

You will do 1 million operations of opening/closing doors.

At operation number 1 you close (the ones opened) and open (the ones closed) that are multiple of 1

At operation number 2 you close (the ones opened) and open (the ones closed) that are multiple of 2

At operation number n you close (the ones opened) and open (the ones closed) that are multiple of n

.
.
.

At operation number 1,000,000 you close (the ones opened) and open (the ones closed) that are multiple of 1,000,000

How many open doors do you have at the end?
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Messages In This Thread
Logic Challenge - by Shidoshi - 2010-11-11, 01:17 PM
Logic Challenge - by Mute - 2010-11-11, 01:20 PM
Logic Challenge - by butterfλi - 2010-11-11, 01:40 PM
Logic Challenge - by Nikkey - 2010-11-11, 02:30 PM
Logic Challenge - by Salguod - 2010-11-11, 02:55 PM
Logic Challenge - by Jedward - 2010-11-11, 02:57 PM
Logic Challenge - by KaidaTan - 2010-11-11, 04:05 PM
Logic Challenge - by Kalovale - 2010-11-11, 04:14 PM
Logic Challenge - by Shidoshi - 2010-11-11, 04:17 PM
Logic Challenge - by Kalovale - 2010-11-11, 04:29 PM
Logic Challenge - by Kaasoljoyyx - 2010-11-11, 04:33 PM
Logic Challenge - by Kalovale - 2010-11-11, 04:51 PM
Logic Challenge - by WayOfTime - 2010-11-11, 05:04 PM
Logic Challenge - by Solarboy - 2010-11-11, 06:14 PM
Logic Challenge - by Shidoshi - 2010-11-11, 06:18 PM
Logic Challenge - by Takebacker - 2010-11-11, 06:18 PM
Logic Challenge - by ¬Rob - 2010-11-11, 06:41 PM
Logic Challenge - by Solarboy - 2010-11-11, 06:42 PM
Logic Challenge - by Mute - 2010-11-11, 07:09 PM
Logic Challenge - by Daku - 2010-11-11, 07:10 PM
Logic Challenge - by Kunagisa - 2010-11-11, 07:11 PM
Logic Challenge - by Stereo - 2010-11-11, 07:15 PM
Logic Challenge - by Kunagisa - 2010-11-11, 07:21 PM
Logic Challenge - by Hanabira.Kage - 2010-11-11, 11:49 PM
Logic Challenge - by Russt - 2010-11-12, 12:14 AM

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