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# Help : CombinaSum

How to evaluate this sum: $\dbinom n0 - \dbinom n2 + \dbinom n4 - \dbinom n6 + \cdots$

Please write a detailed solution. Thanks in advance.

Note by Ashutosh Agrahari
11 months ago

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It is the real part of $$(1+i)^n$$. · 10 months, 3 weeks ago