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Fill in the Blanks  A box contains 2 white balls, 3 black balls and 4 red balls. The number of ways three balls be drawn from the box if at least one black ball is to be included in the draw is ______.

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Required number of ways such that 3 balls are drawn and atleast one black ball is included

 in the draw=  ^3C_1*^ 6C_2+ ^3C_2* ^6C_1+ ^3C_3

=3*15+3*6+1=45+18+1=64

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