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If (1 + x – 2x^2)^6 = 1 + a1x + a2x^2 + ..... + a12x^12, then the value of a1 + a3 + ..... + a11 is

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If (1 + x – 2x2)6 = 1 + a1x + a2x2 + ..... + a12x12, then the value of a1 + a3 + ..... + a11 is

(a) 32 

(b) – 32 

(c) 64 

(d) – 64

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Answer : (b) - 32

Given, (1 + x – 2x2)6 = 1 + a1x + a2x2 + ..... + a12n x12 ...(i)

Putting x = 1, in (i) we have

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