Stones of green and black and red of the same form are contained every ten piece in one box.
How many pieces at least do you have to take out stones to align pair of the same color without looking in the box ?
Answer
That is, even if it takes out with red, black, and green, since it is 1 color from the inside of 3 colors that takes out next, the certainly same color will be two pieces at the 4th piece.
Four stones
Solution
There is certainly the same color stones in four pieces.
That is, even if it takes out with red, black, and green, since it is 1 color from the inside of 3 colors that takes out next, the certainly same color will be two pieces at the 4th piece.
