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A bag contains 4 red, 3 black and 2 white balls. In how many ways 3 balls can be drawn from this bag so that they include at least one black ball?
Dear StudentRequired number of ways = Number of ways of selecting 3 balls out of given 9 balls (without any restriction) - Number of ways of selecting 3 balls when no black ball is to be selected.Hence the answer should be9C3−6C39C3−6C3= 84 - 20= 64Thanks
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