Mathematics · Binomial Theorem

Let (1 + x + 2x2)20 = a0 + a1x + a2x2 + ... + a40x40, then the value of a1 + a3 + a5 + ... + a39 is equal to:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1220(220 + 21)
2219(220 + 21)
3219(220 - 21)✓
4220(220 - 21)

Correct answer

219(220 - 21)

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Let (1 + x + 2x2)20 = a0 + a1x + a2x2 + ... + a40x40, then the value of a1 + a3 + a5 + ... + a39 is equal to:

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Let (1 + x + 2x2)20 = a0 + a1x + a2x2 + ... + a40x40, then the value of a1 + a3 + a5 + ... + a39 is equal to:

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