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a= 1 dan b = 4
x = suku keempat = u4 = 1 + ( 4-1 ) 4 = 1 + 3 x 4 = 13
y = suku ketujuh = u7 = 1 + ( 7-1 ) 4 = 1 + 6 x 3 = 19
jadi x = 13 dan y = 19
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