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t(n) = (n4 - 22n3 + 143n2 - 242n + 168)/24, n = 1, 2, 3, ...
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18 - 16 = 2 14 / 2 = 7 17 + 7 = 24
when x = 2
14Another answer:-17+17-14+(2*6)+2 = 0
2*17=2*10+2*7=20+14=34
divide 17 by 2, and multiply the answer by 14.