B. -4 / -4
ExplanationStep 1: In (a-b)^4 the coefficients are 1 -4 6 -4 1. Step 2: Coefficient of a³b is -4. Step 3: Signs alternate in a minus binomial.
Step 1: (a-b)^4 में coefficients 1 -4 6 -4 1 होते हैं। Step 2: a³b का coefficient -4 है। Step 3: Minus binomial में signs alternate होते हैं।
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