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u5=ar^4 = 48
r^3 = ar^4 / ar = 48/6 = 8
r = ∛8 = 2
ar = 6
a= 6/2 = 3
S8 = a ( r^8 -1) /(r-1)
= 3 (2^8 -1) / (2-1)
= 3(256-1)
= 3(255)
=765... b