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 :
$\mathrm{B}=\mathrm{A}^3$
$3 \mathrm{A}=\mathrm{B}$
$A=3 B$
$\mathrm{A}=\mathrm{B}^3$
Solution
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