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13, 17, 19 और 21 में से किसका 1 और स्वयं के अलावा अन्य गुणनखंड है?

A17
B13
C21
D19
Answer & Solution
Correct answer: C. 21
21 = 3 x 7, अतः 21 के 1 और स्वयं के अलावा गुणनखंड 3 और 7 हैं। अन्य सभी अभाज्य संख्याएं हैं।
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