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2
=216
2.a
a+ 2
a+4
::::::::::::: +
3a+6=39
a=11
U2 a+2 =11+2 =13
ui dan u3
(13 x X) (13 x X) = 1872 : 3
169 x Xkuadrat =144
Xkuadrat = 169-144
= 25
5
jadi barisan tsb adalah 8,13,18