Diketahui suatu barisan arimatika dgn U 11 = 35 dan U 23 = 95. Tentukan suku ke 30

U11 = a + 10b = 35
U23 = a + 22b = 95
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-12b = -60
b = 5

a + 10b = 35
a + 10(5) = 35
a = -15

U30 = a + 29b
U30 = -15 + 29(5)
U30 = -15 + 145
U30 = 130

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