carilah u27 dari barisan 8,11,14

a = 8
b= 3
un = a +(n-1) b
u27= 8 + (27-1)3
u27= 8 + 78
u27=86

U27 a + ( n + 1 ) b

<=> 8 ( 27 + 1 ) 3

<=> 8 ( 28 ) 3

<=> 8 × 84

<=> 672