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February 17th, 2018, 10:24 AM   #1
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Question Discrete Math Binomial Theorem

Please could someone help me the way to approach this?
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February 17th, 2018, 10:33 AM   #2
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Last edited by greg1313; February 17th, 2018 at 12:46 PM.
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February 17th, 2018, 12:48 PM   #3
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$\sum_{k=0}^n\binom{n}{k}2^{n-k}(-1)^k=(2-1)^n=1^n=1$
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