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প্ৰদত্ত বিকল্পসমূহৰ পৰা সম্পৰ্কিত সংখ্যাটো বাছক: 7 : 49 :: 9 : ?

A72
B81
C90
D99
Answer & Solution
Correct answer: B. 81
দ্বিতীয় সংখ্যাটো প্ৰথম সংখ্যাটোৰ বৰ্গ: 7-ৰ বৰ্গ হ'ল 49, আৰু 9-ৰ বৰ্গ হ'ল 81।
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