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Let (1+x+2x^2)^20=a0+a1x+a2x^2+....+a40x...

Let `(1+x+2x^2)^20=a_0+a_1x+a_2x^2+....+a_40x^40. " Then, "a_1+a_3+a_5.....+a_37` is equal to :

A

`2^20(2^20+21)`

B

`2^19(2^20+21)`

C

`2^20(2^20-21)`

D

`2^20(2^20-21)`

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