Question
Write down separately the prime and composite numbers less than $20.$
✓
Answer
Prime no. $= 2,3,5,7,11,13,17,19$
Composite no. $= 4,6,8,9,10,12,14,15,16,18$
Composite no. $= 4,6,8,9,10,12,14,15,16,18$
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