Question

Find the sum of the prime numbers from 20 to 30

Answer 1

23 and 29 are the prime numbers between 20 and 30. No even number is a prime number (except 2). Hence, 20, 22, 24, 26, 28 and 30 are not prime numbers. Out of the rest (21, 23, 25, 27 and 29): 21 and 27 are divisible by 3, so they are not prime numbers.

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Answer 2

The only two prime numbers between 20 and 30 are 23 and 29.

Therefore the sum = 23+29 = 52

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