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  4. If ' a ' be the sum of the odd terms and ' b ' the sum of the even terms of the expansion of (1+x)n, then (1-x2)n=

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Q. If ' $a$ ' be the sum of the odd terms and ' $b$ ' the sum of the even terms of the expansion of $(1+x)^n$, then $\left(1-x^2\right)^n=$

Binomial Theorem

Solution:

Correct answer is (a) $ a^2-b^2$

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