If \( a_{r} \) is the coefficient of \( x^{r} \), in the expansion of \( (1+x \) \( \left.+x^{2}....

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If \( a_{r} \) is the coefficient of \( x^{r} \), in the expansion of \( (1+x \)
\( \mathrm{P} \)
\( \left.+x^{2}\right)^{n} \), then \( a_{1}-2 a_{2}+3 a_{3}-\ldots . .-2 n a_{2 n} \)
W
(1) 0
(2) \( n \)
(3) \( -n \)
(4) \( 2 n \)



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