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3 years ago

how many of the first ten positive whole numbers can be expressed as the sum of two different prime numbers?

1 answer:

7 0

1 = Not Possible
2 = Not Possible
3 = Not Possible
4 = 2 + 2 
5 = 2 + 3 
6 = 3 + 3 
7 = 2 + 5 
8 = 3 + 5 
9 = 2 + 7 
10 = 3 + 7
Taking into account that there must be two "Different" prime numbers, that leaves 5, 7, 8, 9, and 10. So 5 of the first 10 whole numbers.

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