Pada barisan aritmatika suku 1: 6 suku 6 : 42 tentukan suku ke 10

U1 = a = 6
U6 = a + 5b = 42
6 + 5b = 42
5b = 42 -6
' '= 36
b = 36/5
b = 7 1/5
U10 = a + 9 b
= 6 + 9 (7 1/5)
= 6 + 64 4/5
= 70 4/5