Question

Pada deret aritmetika diketahui U1=5 dan U6=55. tentukan U16.

Answer 1

U1 = 5
a = 5

55 = a + (n-1)b
55 = 5 +5b
50 = 5b
b = 10

u 16 = a + 15b
        = 5 +(15)10
        = 5 + 150
        = 155

Answer 2

A=5
u6=55
a + (n-1) b = un
5 + 5b= 55 -> masukkan U6
5b = 50
b = 10

U16 = 5 + 15 * 10
       = 5 + 150
u16 = 155