Asked by unowen

There are 10 coins, 5 of which are heads up and 5 of which are tails up.

On each turn, you choose exactly 3 coins and flip them over.

What is the minimum number of turns needed to make all of the coins heads up?

Answers

Answered by Steve
Looks like 3 to me:
HHHHHTTTTT
HHHHHHHHTT
HHHHHHTTHT
HHHHHHHHHH
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