A box contains math xmlns=http://www.w3.org/1998/Math/MathMLmn...
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A box contains math xmlns=http://www.w3.org/1998/Math/MathMLmn2/mn/math white balls, math xmlns=http://www.w3.org/1998/Math/MathMLmn3/mn/math black balls and math xmlns=http://www.w3.org/1998/Math/MathMLmn4/mn/math red balls. In how many ways can three balls be drawn from the box if atleast one black ball is to be included in a draw (the balls of the same colour are difference
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