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U1 = 4(1) + 9 = 4 + 9 = 13
U2 = 4(2) + 9 = 8 + 9 = 17
U3 = 4(3) + 9 = 12 + 9 = 21
U4 = 4(4) + 9 = 16 + 9 = 25
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barisan bilangannya
13, 17, 21, 25, 29, 33, ...........