Question:
The coefficient of x³ in the expansion of (x-(1)/(x))⁷ is:
The coefficient of x³ in the expansion of (x-(1)/(x))⁷ is:
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Match the power of x to find the required term.
Updated On: Mar 20, 2026
- 14
- 21
- 28
- 35
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The Correct Option is B
Solution and Explanation
Step 1: General term: Tk+1=\binom7kx⁷-2k(-1)ᵏ
Step 2: Set power 7-2k=3 ⟹ k=2.
Step 3: Coefficient =\binom72=21.
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