B. 0.3
ExplanationStep 1: Identify the concept: this is complement probability. Step 2: P(not A)=1-P(A)=1-0.7=0.3. Step 3: Probability of an event and its complement sum to 1.
Step 1: concept पहचानें: यह complement probability है। Step 2: P(not A)=1-P(A)=1-0.7=0.3। Step 3: Event और complement का sum 1 होता है।
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