If the sum of the coefficients in the expansion of \( \left(1-3 x+10 x^{2}\right)^{n} \) is \( a....

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If the sum of the coefficients in the expansion of \( \left(1-3 x+10 x^{2}\right)^{n} \) is \( a \) and if the sum of the coefficients
\( \mathrm{P} \)
in the expansion of \( \left(1+x^{2}\right)^{n} \) is \( b \), then
(1) \( a=3 b \)
(2) \( a=b^{3} \)
(3) \( b=a^{3} \)
(4) None of these



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