Question

A box contains 4 green 5 yellow and 6 white marbles. 3 marbles are drawn at random. What is the probability that all three marbles are of same color.

Answer 1

This can be calculated by calculating the probability of all three marbles being of the same colour and subtracting this probability from 1.

Therefore,

P (all three marbles are not of same colour) = 1 - P (all three marbles are of same colour)

P (all three marbles are of same colour) = 5C3/12C3 + 4C3/12C3 + 3C3/12C3

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