19 January 2014

138. Sticks in a row : Turn 3 at a time

Easy Medium Hard Extreme

The 11 matchsticks are placed with heads up as shown. The challenge is to turn ALL the matchsticks into heads down. The following rules apply:

1. Turn 3 matchsticks at a time.
2. The 3 matchsticks you turn don't have to be adjacent.

Can you achieve this within 5 steps?

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