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If x (F)14b (K)89b (U)6, then n (A)20n (B)18n (U)45, obviously.
6n(2n - 3)
6(n - 4)(n + 1) n = 4, -1
The equation is: 18N+2 = 19N
It could be 37. Use Un = (n4 - 6n3 + 18n2 - 18n + 168)/24 with n = 6