pada deret aritmatika, diketahui u2 =16, u8 = 58, n = 60.

U2 = a + b
16 = a + b

U8 = a + 7b
58 = a + 7b

Gunakan metode eliminasi
a + b = 16
a + 7b = 58
_________-
-6b = -42
b = 7

a + b = 16
a = 16 - 7
a = 9

U60 = a + 59b
U60 = 9 + 59(7)
U60 = 9 + 413
U60 = 422

Semoga berguna +_+