C. 3 / 3
ExplanationStep 1: In (1+x)^n coefficient of x^r is nCr. Step 2: For x² it is 3C2 = 3. Step 3: In binomial theorem treat the power as r.
Step 1: (1+x)^n में x^r का coefficient nCr होता है। Step 2: x² के लिए 3C2 = 3। Step 3: Binomial theorem में power को r समझें।
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