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U10 = 41
cari beda
41-21 = 20 = 4
10-5 5
cari a
U5=a+4b
21 = a+(4 x 4)
21 = a+16
a=21-16 = 5
maka a=5, b=4
ditanyakan = U20
U20 = a+(n-1)b
U20 = 5 + (20-1)4
U20 = 5+(19 x 4)
U20 = 5 + 76 = 81
a + 9b = 41
---------------- (-)
- 5b = - 20
b = - 20 : - 5 = 4
a + 4(4) = 21
a + 16 = 21
a = 21 - 16 = 5
Dengan demikian :