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U6 = 160
U6 = ar^5
160 = 5r^5
160/5 = r^5
r^5 = 32
r = 2
Sn = a(r^n -1)/ r-1
S6 = 5 (2^6 - 1) / 2-1
S6 = 5 (64-1) / 1
S6 = 5 x 63
S6 = 315 m
u6=160 r=2
S6 =6/2(2.5+(6-1).2)
=3(20)
=60