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مندرجہ ذیل میں سے کون سا مرکب نمبر ہے؟

A19
B23
C29
D21
Answer & Solution
Correct answer: D. 21
21 میں 1، 3، 7، اور 21 عوامل ہیں، جو اسے ایک جامع نمبر بناتے ہیں۔ 19، 23، اور 29 بنیادی نمبر ہیں۔
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