C. 21 / 21
ExplanationStep 1: In (1+x)^n coefficient of x^r is nCr. Step 2: Here the coefficient is 7C2 = 21. Step 3: Use nCr for binomial coefficient.
Step 1: (1+x)^n में x^r का coefficient nCr होता है। Step 2: यहां coefficient 7C2 = 21 है। Step 3: Binomial coefficient के लिए nCr लगाएं।
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