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इनमें से कौन सा संख्या युग्म सह-अभाज्य (coprime) है?

A12 और 18
B14 और 21
C8 और 15
D20 और 25
Answer & Solution
Correct answer: C. 8 और 15
8 और 15 में 1 के अलावा कोई उभयनिष्ठ गुणनखंड नहीं है (gcd = 1), अतः यह सह-अभाज्य युग्म है।
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