Dahh, 3+2=5
Also, 4 + 1 = 5
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28
if you mean what three prime numbers add up to a prime number then the answer is : 5 + 7 + 11 = 23
21
5+13
Same as average. For example, if you have 5 numbers, add them all up, then divide the result by 5. If you have 10 numbers, you add and divide by 10, etc.