Mathematics · Binomial Theorem
The coefficient of xn in the expansion of (1 - 2x + 3x2 - 4x3 + ...)-n is
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1n2
- 2(2n)!(n+1)! (n-1)!
- 3(2n)!(n!)2✓
- 4(-1)n+1n
Correct answer
(2n)!(n!)2
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