allery20 కంటే తక్కువగా ఉన్న ప్రధాన సంఖ్యలు ఎన్ని?
A8
B6
C9
D7
Answer & Solution
Correct answer: A. 8
20 కంటే తక్కువగా ఉన్న ప్రధాన సంఖ్యలు 2, 3, 5, 7, 11, 13, 17 మరియు 19, అంటే మొత్తం ఎనిమిది.
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