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Divide both by 3 18 / 153 = 6 / 51 then same again 6 / 51 = 2 / 17
The answer is 18C6 which stands for 18!/[6!*(18-6)!] where n! means 1*2*3*...*n. That simplifies to 18*17*16*15*14*13/(6*5*4*3*2*1) = 18564
(6/17) / 2 = 3/17
There are probably tens of such sets. Some are: 5, 6, 7, 7, 8, 11, 13, 14, 15, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 15, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 15, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 16, 16, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 16, 16, 18
14Another answer:-17+17-14+(2*6)+2 = 0