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28 July, 16:57

What is the second term in the binomial expansion of (2r-3s) ^12

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  1. 28 July, 20:52
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    (a-b) ¹²=a¹²-12a¹¹b + ...

    Let a=2r and b=3s then the second term is - 12 (2r) ¹¹ (3s) = - 73728r¹¹s.
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