30 basketballs (15 Spalding, 10 Wilson, and 5 other brand-name balls) are on a basketball court. Barry Wood closes his eyes and arbitrarily picks up a ball from the court. Determine the probability that the ball selected is a Wilson or a Spalding

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owlfred · Answer

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anonymous · Answer

15C1/30C1
=1/2

anonymous · Answer

sorry
that will be 15C1/30C1 + 10C1/30C1
=1/2 +1/3 =5/6