Diketahui suatu barisan aritmetika mempunyai U5 = 2 dan U1 = 17 tentukanlah U20
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Penyelesaian
U5 = 2
U1 = 17
Un = a + (n-1)b
U5 = a + (5-1)b 2
= a + 4b
U1 = a17
= a
2 = 17 + 4b 4b = -15 b
= -15/4
= -3
U20 = a + (20-1)b
= 17 + (20-1)(-3)
= 17 - 57
= -40