A bag contains three white balls numbered 1, 2, 3 and four black balls numbered 4, 5,

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A bag contains three white balls numbered 1, 2, 3 and four black balls numbered 4, 5, 6, 7. If one ball is drawn at random, find the probability of each event described in Problems.

(a) The ball is red.

(b) The ball is numbered less than 8.

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