diketahui barisan bilangan berikut. 4, 7, 10, 13,... suku ke berapakah bilangan 127? A.40 B.41 C.42 D.43 Please jawabin pkek cara

Un = a + (n-1) b
a = U1 = 4
b = beda = 3

Rumus : Un = 4 + (n-1)3

127 = 4 + (n-1)3
127 = 4 + 3n - 3
127 = 3n + 1
3n = 127 - 1
3n = 126
n = 126/3
n = 42 (c)