C. 3/10 / 3/10
ExplanationStep 1: Complement rule is P(A') = 1 - P(A). Step 2: 1 - 7/10 = 3/10. Step 3: Probability of event and complement adds to 1.
Step 1: Complement rule P(A') = 1 - P(A) है। Step 2: 1 - 7/10 = 3/10। Step 3: Event और complement की probability का sum 1 होता है।
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