A committee of math xmlns=http://www.w3.org/1998/Math/MathMLmn...

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A committee of math xmlns=http://www.w3.org/1998/Math/MathMLmn7/mn/math has to be formed from math xmlns=http://www.w3.org/1998/Math/MathMLmn9/mn/math boys and math xmlns=http://www.w3.org/1998/Math/MathMLmn4/mn/math girls. In how many ways can this be done when the committee consists of:
(i) exactly math xmlns=http://www.w3.org/1998/Math/MathMLmn3/mn/math girls?
(ii) at least math xmlns=http://www.w3.org/1998/Math/MathMLmn3/mn/math girls?
(iii) at most math xmlns=http://www.w3.org/1998/Math/MathMLmn3/mn/math girls
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