Q. 475.0( 3 Votes )
Given a G.P. with a = 729 and 7th term 64, determine S7.
a = 729
7th term = 64
∴ a7 = ar6, where r is the common ratio.
729r6 = 64
r6 = 64/729
r6 = (2/3)6
r = 2/3 < 1
∴ S7 = 2059
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