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U25 = a + 24b ⇒ 70 = a + 24b..... (2)
eliminasi persamaan (1) dan (2)
a + 4b = 30
a + 24b = 70 -
-20b = -40
b = 2
substitusi b ke persamaan (1)
a + 4(2) = 30
a + 8 = 30
a = 30 - 8
a = 22
U35 = a + 34b
= 22 + 34(2)
= 22 + 68
= 90
jadi suku ke-35 adalah 90