My Math Forum Question Discrete Math Binomial Theorem

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 February 17th, 2018, 09:24 AM #1 Member   Joined: Oct 2017 From: Rumba Posts: 39 Thanks: 0 Question Discrete Math Binomial Theorem Please could someone help me the way to approach this?
 February 17th, 2018, 09:33 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,549 Thanks: 1399 answered at MathHelpForum.com Last edited by greg1313; February 17th, 2018 at 11:46 AM.
 February 17th, 2018, 11:48 AM #3 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,963 Thanks: 1148 Math Focus: Elementary mathematics and beyond $\sum_{k=0}^n\binom{n}{k}2^{n-k}(-1)^k=(2-1)^n=1^n=1$

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