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U3 = 16
a.r^2 = 16
64.r^2 = 16
r^2 = 16/64
r = √1/4
r = 1/2
S10 = a.(1 - r^n)/(1-r)
S10 = 64.(1 - (1/2)^10)/(1 - 1/2)
S10 = 64.(1 - 1/1024)/(1/2)
S10 = 64.1023/1024.2/1
S10 = 1023/8 = 127 7/8