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Let (1 + x + 2x^2)^20 = a0 + a1x + a2x^2 +...+ a40x^40. then a1 + a3 + a5 +... + a37 is equal to

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+2 votes
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in Mathematics by (34.7k points)

Let (1 + x + 2x2)20 = a0 + a1x + a2x2 +...+ a40x40. then a1 + a3 + a5 +... + a37 is equal to

(1) 220(220 - 21)

(2) 219(220 - 21)

(3) 219(220 + 21)

(4) 220(220 + 21)

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1 Answer

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Correct option is (2) 219(220 - 21)

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