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The probability of an event A is 0.7. The probability of its complement, not-A, equals:
A0.7 again
B1.7 in total
C0.49 exactly
D0.3 exactly
Answer & Solution
Correct answer: D. 0.3 exactly
1. The complement rule states P(not A) = 1 minus P(A).
2. Substitute P(A) = 0.7 into the rule.
3. P(not A) = 1 - 0.7 = 0.3.
_Source: NCERT Class 11 Mathematics, Ch 14 'Probability' (kemh114)_
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