If A denotes the sum of all the coefficients in the expansion of \left(1-3 x+10 x^2\right)^{\mathrm{n}} and B denotes the sum of all the coefficients in the expansion of \left(1+x^2\right)^n, then :

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Answer: D. \mathrm{A}=\mathrm{B}^3 Sum of coefficients in the expansion of \left(1-3 \mathrm{x}+10 \mathrm{x}^2ight)^{\mathrm{n}}=\mathrm{A} then A=(1-3+10)^n=8^n (put x=1) and sum of coefficients in the expansion of \begin{aligned} & \left(1+x^2ight)^n=B \ & 	ext { then } B=(1+1)^n=2^n \ & A=B^3 \end{aligned}

If A denotes the sum of all the coefficients in the expansion of $\left(1-3 x+10 x^2\right)^{\mathrm{n}}$ and B denotes the sum of all the coefficients in the expansion of $\left(1+x^2\right)^n$, then :

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