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Write down separately the prime and composite numbers less than 20 .
To do:
We have to write separately the prime and composite numbers less than 20.
Solution:
Prime numbers are those numbers that are divisible by themselves and 1.
Composite numbers are those numbers that are NOT prime numbers.
$2, 3, 5, 7, 11, 13, 17$ and $19$ are the prime numbers less than 20.
$4, 6, 8, 9, 10, 12, 14, 15, 16$ and $18$ are the composite numbers less than 20.
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