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u6 = ar^5 = 160
ar^5/a = r^5
r^5 = 160/5 =32
r = 2
S6 = a ( r^n - 1) / (r-1)
S6 = 5 (2^6 - 1) / (2-1)
= 5 ( 64-1)
= 5 (63)
= 315m