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ਇਹਨਾਂ ਵਿੱਚੋਂ ਕਿਹੜਾ ਇੱਕ ਸੰਯੁਕਤ ਸੰਖਿਆ ਹੈ?

A19
B23
C29
D21
Answer & Solution
Correct answer: D. 21
21 ਦੇ ਕਾਰਕ 1, 3, 7, ਅਤੇ 21 ਹਨ, ਜੋ ਇਸਨੂੰ ਇੱਕ ਸੰਯੁਕਤ ਸੰਖਿਆ ਬਣਾਉਂਦੇ ਹਨ। 19, 23, ਅਤੇ 29 ਅਭਾਜ ਸੰਖਿਆਵਾਂ ਹਨ।
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