Question

2)A tourist has 15 pairs of pants in his hotel room closet. Suppose 5 are blue and the rest are black. The tourist leaves his room twice a day. He takes a pair of pants and puts them on, the tourist leaves the first pair of pants in the closet again and takes another one and puts them on. What is the probability that the two pants chosen are black?

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Santino

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number of black pants is 10
total number of pants is 15
probability two pants are black:
\frac{10}{15}\:\:x\:\:\frac{10}{15}
answer\:\frac{4}{9}

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