tolong dijawab beserta caranya

4, 7, 10, 13,...., 136

Nilai a = 4
nilai b = 7 - 4 = 3
Un = 136

Sehingga, banyak suku barisan

Un = 136
a + (n - 1)b = 136
4 + (n - 1)(3) = 136
4 + 3n - 3 = 136
3n = 136 - 1
3n = 135
n = 135/3
n = 45 → Opsi C