C. 3 / 3
ExplanationStep 1: Expansion is (a+b)^3 = a³ + 3a²b + 3ab² + b³. Step 2: Coefficient of a²b is 3. Step 3: Remember cube expansion coefficients 1 3 3 1.
Step 1: Expansion (a+b)^3 = a³ + 3a²b + 3ab² + b³ है। Step 2: a²b का coefficient 3 है। Step 3: Cube expansion में coefficients 1 3 3 1 याद रखें।
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