A box contains two white balls, three black balls nd four red balls. The number of ways in which

Описание к видео A box contains two white balls, three black balls nd four red balls. The number of ways in which

A box contains two white balls, three black balls nd four red balls. The number of ways in which three balls can be drawn from the box so that at least one of the balls is black is (A) 74 (B) 84 (C) 64 (D) 20

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