Question

The numbers 13 and 31 are prime numbers. Both these numbers have sa
and 3. Find such pairs of prime numbers upto 100.
4. Write down separately the prime and composite numbers less than 20.​

Answer 1

Answer:

1.Prime numbers are the positive integers having only two factors, 1 and the integer itself.

Pairs of prime numbers are

• 17 and 71

• 37 and 73

• 79 and 97

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2.Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19

Composite numbers: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18