MathDB

5

Part of 1997 Canadian Open Math Challenge

Problems(1)

COMC 1997 #5

Source:

6/8/2017
Two cubes have their faces painted either red or blue. The 1st cube has five red faces and one blue face. When the two cubes are rolled simultaneously, the probability that the two top faces show the same color is 12\frac{1}{2}. How many red faces are there on the second cube?