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A statement that is sometimes true and sometimes false is called
Aa tautology
Ba contingency
Ca contradiction
Da paradox
Answer & Solution
Correct answer: B. a contingency
1. A compound statement whose truth values include both T and F is a contingency.
2. A tautology is always T; a contradiction is always F.
3. Hence the answer is contingency.
_Source: Maharashtra Balbharati Std XII Mathematics Part 1, Ch 1 "Mathematical Logic" §1.6_
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