alleryকমপক্ষে একটি ল্যাম্প P এবং Q চালু আছে। P বন্ধ আছে। কোনটি সত্য হতে হবে?
APও চালু আছে
BQ বন্ধ আছে
Cদুটোই বন্ধ
DQ চালু আছে
Answer & Solution
Correct answer: D. Q চালু আছে
যেহেতু P বন্ধ এবং অন্তত একটি বাতি চালু আছে, Q অবশ্যই চালু থাকতে হবে৷
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