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Un = a + (n – 1)b
U2 + U15 + U40 = 165
(a + b) + (a + 14b) + (a + 39b) = 165
3a + 54b = 165
a + 18b = 55
a = 55 – 18b.......(1)
U19 = a + 18b
substitusi (1)
U19 = (55 – 18b) + 18b
U19 = 55 <--
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