alleryতলৰ কোনটো যৌগিক সংখ্যা?
A19
B23
C29
D21
Answer & Solution
Correct answer: D. 21
21-ৰ উৎপাদকবোৰ হ'ল 1, 3, 7 আৰু 21, যাৰ বাবে ই এটা যৌগিক সংখ্যা। 19, 23 আৰু 29 মৌলিক সংখ্যা।
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