alleryलैंप P और Q में से कम से कम एक चालू है। P बंद है. कौन सा सच होना चाहिए?
AP भी चालू है
BQ बंद है
Cदोनों बंद हैं
DQ चालू है
Answer & Solution
Correct answer: D. Q चालू है
चूँकि P बंद है और कम से कम एक लैंप चालू है, Q अवश्य चालू होना चाहिए।
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