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115 = 10 + (n-1) x 7
115-10 = (n-1) x 7
105 = (n-1) x 7
n - 1 = 105/7 = 15
n = 15 - 1 = 14
b = 17 - 10 = 7
Un = a + (n -1)b
115 = 10 + (n - 1)7
115 = 7n + 3
112 = 7n
n = 16
Jadi, ada 16 suku dalam deret bilangan tersebut.