B. 9 / 9
ExplanationStep 1: In (1+x)^n coefficient of x^r is nCr. Step 2: For x r=1 so 9C1 = 9. Step 3: Coefficient of first power is n.
Step 1: (1+x)^n में x^r का coefficient nCr होता है। Step 2: x के लिए r=1 इसलिए 9C1 = 9। Step 3: First power का coefficient n होता है।
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