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  4. The sum of the co-efficients in the expansion of (1-2 x+5 x2)n is ' a ' and the sum of the coefficients in the expansion of (1+x)2 n is b. Then :

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Q. The sum of the co-efficients in the expansion of $\left(1-2 x+5 x^2\right)^n$ is ' $a$ ' and the sum of the coefficients in the expansion of $(1+x)^{2 n}$ is $b$. Then :

Binomial Theorem

Solution:

$a =4^{ n } ; b =2^{2 n }=4^{ n }$