8 and 1
8+1=9
8*1=8
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Numbers that have a product of 8 are 1,8 and 2,4. Their sums are 9 and 6 respectively. Numbers that have a product of 7 and a sum of 8 are 1 and 7.
9 and 8
4 and 5 have the sum of 9 and the product of 20.
The sum of 8 and 5 is 13. There is then no number with which to calculate its product.
The sum of 1 + 8 is 9.