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Semoga membantu.......U1= 1
U2= 1/4
U2= U1*r
r= U2/U1= 1/4 : 1= 1/4
Sn= U1/(1-r)= 1/(1-1/4)= 1 : (4-1)/4= 1: 3/4= 1*4/3= 4/3....
jadi jumlah tak hingga= 4/3...