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u6=ar^5 = 3.072
r^5 = u6/a=ar^5/a = 3.072/3=1.024
r=4
u2 = ar = 3 x 4 = 12
u5= ar^4= 3 x 4^4= 3 x 256= 768
u2 + u5= 12+768= 780