They are: 2+7+11 = 20
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3 + 17 = 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.
600 * * * * * It is, in fact, 639
3 and 17
-20