B. 20 / 20
ExplanationStep 1: In binomial expansion the coefficient of x³ is 6C3. Step 2: 6C3 = 20. Step 3: In (1+x)^n the coefficient of x^r is nCr.
Step 1: binomial expansion में x³ का coefficient 6C3 होता है। Step 2: 6C3 = 20। Step 3: (1+x)^n में x^r का coefficient nCr होता है।
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