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Please help me how to solve this question It's just confusing my mind.

Q)How many different 20 persons committees can be formed each containing at least 2 professors and at least 3 Associate Professor from a set of 10 professors and 42 Associate Professors.

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    Declarations of urgency are usually counterproductive... I suggest you choose a descriptive title for your problem and maybe you include some of the confused thoughts you have?2012-09-11
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    try looking up nPr and nCr2012-09-11
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    @MaoYiyi I believe searching for npr and ncr won't help much. Npr will bring up National Public Radio, for example. How about combinations and permutations?2012-09-11
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    @Graphth sorry, I have just used the formula so much, that I forgot that someone may not understand what I wrote. Thanks, for keeping me on my toes.2012-09-11
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    This is a very helpful site and I believe explains what you need better than wikipedia. http://www.mathsisfun.com/combinatorics/combinations-permutations.html2012-09-11
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    @MaoYiyi No problem, thanks for doing a bit of research to help the OP.2012-09-11
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    @Graphth Incidentally, a search for the National Public Radio version of "nPr" will likely include more than one result including "committees" and "professors" ;)2012-09-11

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