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a=100
U3=1
ar²=1
100 r²=1
r²=1/100
r=1/100 atau -1/100
2.Un=1 dan r=4n
Un=1
ar^n-1=1
a(4n)^n-1=1
a=1/(4n)^n-1
U1=a
U1= 1/(4.1)=1/4
U2=ar
U2=1/4. 4n
U2=1/4 . 4(2)
U2=2
r=2/ 1/4
r=8
deret tak hingga gak da, krn rasionya tidak -1<r<1