4 marbles we have to take out (without looking) to be sure that we have at least two marbles of the same color.
There are 4 black, 4 red, and 4 white marbles in a box.
So, in order to have atleast two marbles of the same color we must take out atleast four marbles.
That is 1 black, 1 red, and 1 white of each color and the fourth one may be of any color. So we have atleast two marbles of the same color.
Therefore we have to rake out atleast 4 marbles in order to have at least two marbles of the same color.
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