First of all, it's a good idea to turn it into a math problem. Secondly, the answer is simple, because three coins are turned twice at a time, and three cannot be divisible by two. Therefore, when three coins are heads at the same time, it is impossible to turn three coins into tails at the same time. In fact, the truth is this: after the first turning point, there must be two opposites and one positive situation. No matter what you turn over in the future, it will be nothing more than two situations (one: turning over right and wrong, and the result is still positive and wrong; Two: reverse the two opposites: the result is 3 positive) In addition, there is an infinite loop, so it cannot be obtained.

The latter question is naturally simple. Six pieces turn three at a time. Considering the limit situation, the first time against three pieces, the second against the other three pieces. Is that okay? Because six is divisible by three.