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If ( 1 + x - 2x^(2))^(20) = sum(r=0)^(4...

If ` ( 1 + x - 2x^(2))^(20) = sum_(r=0)^(40) a_(r) x^(r) ` , then find
the value of ` a_(1) + a_(3) + a_(5) + …+ a_(39)` .

A

`2^(19)(2^(20)-1)`

B

`2^(20)(2^(20)-1)`

C

`2^(19)(2^(19)-1)`

D

None of these

Text Solution

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The correct Answer is:
A
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