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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
7 months, 1 week ago

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It is the real part of \((1+i)^n\). Indraneel Mukhopadhyaya · 7 months ago

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Hint: roots of unity Calvin Lin Staff · 7 months, 1 week ago

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