C. 3/7 / 3/7
ExplanationStep 1: Complement rule is P(A') = 1 - P(A). Step 2: 1 - 4/7 = 3/7. Step 3: Probability of an event and its complement adds to 1.
Step 1: Complement rule P(A') = 1 - P(A) होता है। Step 2: 1 - 4/7 = 3/7। Step 3: Event और complement की probability का sum 1 होता है।
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