11 = (42 - 4) - (4 / 4)
12 = (4 + 4) + (√4 + √4)
13 = (42 - 4) + (4 / 4)
14 = (4 + 4 + 4 + √4)
15 = (4 * 4) - (4 / 4)
16 = (4 + 4 + 4 + 4)
17 = (42 + √4) - (4 / 4)
18 = (42 + 4) - (4 - √4)
19 = (42 + 4) - (4 / 4)
20 = (4 * 4) + (√4 + √4)
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how do i make 17 using only 2 4 6 8
3*3*2*1 = 18 of them.
9
Twelve of them.
Google "Four Fours" and you will find a number of solutions, presented more comprehensively than we can.