it add 26
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Using the rule Un = (-134n5 + 2335n4 - 15280n3 + 46295n2 - 64356n + 37020)/60 for n = 1, 2, 3, ... the next number is -531.
54, 72, 90
72 = 49 82 = 64 Its closer to 49 so say 7
49/72 is in its simplest form.
72 = 49