8
Using only sums and differences, and not necessarily all four numbers, 1, 3, 9 and 27 will make all numbers from 0 to 40.
101
5x5x5x3=375
add them all together and then divide the answer by the number of numbers.
8
hyp~95# 34 £
5*4+3+2
how do i make 17 using only 2 4 6 8
You can't unless something is missing in your question.
3*3*2*1 = 18 of them.
Using only sums and differences, and not necessarily all four numbers, 1, 3, 9 and 27 will make all numbers from 0 to 40.
9
Twelve of them.
Google "Four Fours" and you will find a number of solutions, presented more comprehensively than we can.
1234
Using 1, 2, and 3, you can make 27 whole numbers.