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u7 = ar^6 = 2
r^4 = ar^6/ar^2 = 2/32= 1/16
r = 1/2
ar^2 = 32
a x 1/4 = 32
a = 128
S10 = a(1 -r^10) / (1-r)
= 128 ( 1 - 1/1.024 ) / ( 1/2)
=256 ( 1.023/1.024)
= 255,75