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নিচের কোনটি যৌগিক সংখ্যা?

A19
B23
C29
D21
Answer & Solution
Correct answer: D. 21
21-এর উৎপাদকগুলি হলো 1, 3, 7 এবং 21, যা এটিকে একটি যৌগিক সংখ্যা করে তোলে। 19, 23 এবং 29 হলো মৌলিক সংখ্যা।
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