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What is the coefficient of x⁴ in (1 + x)¹⁰?

Answer and explanation

Correct answer: ¹⁰C₄

The governing concept is the binomial theorem: (1+x)¹⁰ = Σ from r=0 to 10 of ¹⁰Cᵣxʳ. The term containing x⁴ is obtained by taking r=4, so its coefficient is ¹⁰C₄. Equivalently, view the expression as a product of ten factors (1+x). To create x⁴, choose x from exactly four factors and choose 1 from the remaining six. The four factors can be selected in ¹⁰C₄ ways, and each selection contributes one x⁴ term. Thus option B is correct. ¹⁰P₄ incorrectly counts an order among the four selected factors, 10⁴ has no valid binomial-selection interpretation, and 4! counts arrangements that do not produce different terms because multiplication is commutative.

Related tags

Binomial TheoremCoefficientCombinationsGeneral And Middle Terms In Binomial ExpansionBinomial TheoremMathematicsClass 11 Mcq

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