If (1 + x - 3x^(2))^(10) = a(0) + a(1)x ...

If `(1 + x - 3x^(2))^(10) = a_(0) + a_(1)x + a_(2)x^(2) + ....... + a_(20)x^(20)`, then `a_(2) + a_(4) + a_(6) + ……. + a_(20) =`

`(b^(n) - a^(n))/(b - a)`

`(a^(n) - b^(n))/(b - a)`

`(a^(n + 1) - b^(n + 1))/(b - a)`

`(b^(n + 1) - a^(n + 1))/(b - a)`

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