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If |x|<1, then find the coefficient of x...

If `|x|<1,` then find the coefficient of `x^n` in the expansion of `(1+2x+3x^2+4x^3+)^(1//2)dot`

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The correct Answer is:
990
`(1+x)^(11) + (1+x)^(11) = (1+.^(11)C_(1)x+ .^(11)C_(2)x^(2)+.^(11)C_(3)x^(3) + .^(11)C_(4)x^(4)+"…….") xx (1+.^(11)C_(1)(x^(2))+.^(11)C_(2)(x^(2))^(2)+"……")`
Coefficient of `x^(4)` is `.^(11)C_(2).1 + .^(11)C_(1)..^(11)C_(2).+ .^(11)C_(4) = 990`
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