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13، 17، 19 اور 21 میں سے کس کا 1 اور خود کے علاوہ کوئی عنصر ہے؟

A17
B13
C21
D19
Answer & Solution
Correct answer: C. 21
21 3 x 7 کے برابر ہے، لہذا یہ دو چھوٹے قدرتی نمبروں کی پیداوار ہے، جبکہ دیگر میں ایسی کوئی تقسیم نہیں ہے۔
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