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maka b = 7
a = 3
u2 = 10
u3 = 17
u4 = 24
u5 = 31
u6 = 38
u7 = 45
u8 = 52
karena disisipka 8 maka ditambah bilangan 3 dan 57 dan semua ada 10 barisan
sehingga,
Un = a + (n-1)b
U10= 3 + (10-1)b
57=3+9b
57-3= 9b
54=9b
b= 54/9= 6