Brain Teaser 10/7/2014

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?

Solution

||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

ENTERTAINMENT COLLECTIBLES: Shop for Collectibles & Fine Art, Movies and TV, Music, Theater and Sports Collectibles.

from A Daily Brain Teaser http://ift.tt/1Eomn6r

3d wooden brain teasers from craftypuzzles.com