4. Write down separately the prime and composite numbers less than 20.
Prime numbers less than 20 are : 2, 3, 5, 7, 11, 13, 17, 19
Composite numbers less than 20 are : 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
JNVST Class 9, 11 admit card 2026 out; download at navodaya.gov.in
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