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u3 = ar^2 = 64
ar^2 = 64
16 x r² = 64
r² = 64/16 = 4
r =√4 = 2
S5 = a( r^5 -1) / ( r-1)
= 16 ( 2^5 -1) / ( 2-1)
= 16 (32 -1) / 1
= 16 (31)
=496