write down separatel the prime and composite numbers less than 20
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prime -2,3,5,7,11,13,17,19
composite - 4,6,8,9,10,12,14,15,16,18,
composite - 4,6,8,9,10,12,14,15,16,18,
siar:
1 is not a prime number
why
i edited and i have written the full answer
1 is coprime
it is divisible by 1 no. only i.e. 1 itself
prime number is the one which is divisible by itself as well as 1
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