There are 6 groups.
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well we'll need to know which numbers they are. . . so, i don't know.
There are 5*4*3 = 60 groups.
you can make at least 25 sums
4 groups of 10 = 40. 40 /5 = 8 so the answer is 8 groups of 5.
20 There can be two answers to this: I'll assume this is what you meant-> let's say you mean like pairing the numbers 1-5 with the numbers 6-9. 5*4=20