7+3=10 17+3=20 17+13=30
They are: 2+7+11 = 20
To find the sum of all prime numbers between 20 and 40, we first list out the prime numbers in that range: 23, 29, 31, 37. Then, we simply add them together: 23 + 29 + 31 + 37 = 120. Therefore, the sum of all prime numbers between 20 and 40 is 120.
3 and 17
600 * * * * * It is, in fact, 639
7+3=10 17+3=20 17+13=30
148
It is 75.
They are: 2+7+11 = 20
17 and 3 are two prime numbers whose sum is 20. Their product is 51.
To find the sum of all prime numbers between 20 and 40, we first list out the prime numbers in that range: 23, 29, 31, 37. Then, we simply add them together: 23 + 29 + 31 + 37 = 120. Therefore, the sum of all prime numbers between 20 and 40 is 120.
3 and 17
600 * * * * * It is, in fact, 639
-20
17
It is 1.
(2,3) and (2,5) are the two pairs such that the sum of their elements is a prime number.