Fewpal
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A box contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the box, if at least one black ball is to be included in the draw?

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We may have(1 black and 2 non-black) or (2 black and 1 non-black) or (3 black).

∴ Required number of ways

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