diketahui barisan bilangan 4,10,20,34.....tentukan:rumus suku ke n barisan bilangan tersebut!branly.co.id

a = U1 =4
b = U2 - U1 = 10-4 = 6
rumus
un = a + (n - 1 ) b
= 4 + (6 - 1 ) 6
= 4 + 5 × 6
= 4 + 30
= 34
sorry ka2lo salah