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u7= ar^(7-1)=224
=ar^6=224
maka 224 dibagi 7/2
r^6= 224 X 2/7=...
maka r=... diakar 6
U7=24
a+6b=24
7/2+6b=24
6b =24-7/2
6b = 41/2
b= 41/2/6
b= 41/12
kemudian mencari U4 dengan rumus U4= a+(n-1)b