D. npq
ExplanationStep 1: Identify the concept: mixed probability. Step 2: The variance of a binomial distribution is npq. Step 3: Exam tip: Revise both formulas and definitions.
Step 1: अवधारणा mixed probability है। Step 2: Binomial variance npq होता है। Step 3: याद रखें: Formula और definition दोनों revise करें।
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