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+5
391
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avatar+4664 
Long Brain teaser!
 
 
Suppose you're in a hallway lined with 100 closed lockers. 
You begin by opening every locker. Then you close every second locker. Then you go to every third locker and open it (if it's closed) or close it (if it's open). Let's call this action toggling a locker. Continue toggling every nth locker on pass number n. After 100 passes, where you toggle only locker #100, how many lockers are open?
 
If stuck:
No Spoilers
Answers.
http://www.braingle.com/brainteasers/7824/100-closed-lockers.html
 
MathsGod1  Mar 26, 2015

Best Answer 

 #1
avatar+91432 
+5

Thanks MG 

I have added this to our Puzzle (Logic) sticky thread.

We have had it before but it is a really good one and it is well presented. 

Melody  Mar 27, 2015
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1+0 Answers

 #1
avatar+91432 
+5
Best Answer

Thanks MG 

I have added this to our Puzzle (Logic) sticky thread.

We have had it before but it is a really good one and it is well presented. 

Melody  Mar 27, 2015

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