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Dik. barisan deret aritmatika :9, 14, 19, 24, ... , 154.
Dit. banyaknya suku (n) ?
Jawab...
beda = u2 - u1 = 14 - 9 = 5
Un = a + (n-1) b
154 = 9 + (n-1) (5)
154 = 9 + 5n - 5
154 = 5n + 4
154 - 4 = 5n
150 = 5n
n = 150/5
n = 30.
Jadi, banyaknya suku deret tersebut ada 30.
Semoga membantu.. ^_^