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Math Help - More binomial trouble

  1. #1
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    More binomial trouble

    Find and simplify coefficient of x^7y^15 in expression (x+y)^22.

    My work:

    22! / 7!15!

    Teacher solutions: 170544
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  2. #2
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    Nvm I just got it!
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  3. #3
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    e^(i*pi)'s Avatar
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    I'm guessing you figured out those two expressions are equal to each other
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