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2 = a+b
** U5 = a+4b
17 = a+4b
Eliminasi * dan **
Maka diketahui nilai a = -3 dan b = 5
a) -3, 2, 7, 12, 17, 22, 27
b) U20 = a+19b
= -3+19(5)
= -3+ 95
= 92