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 ∴ S7 = 2059

Q. 475.0( 3 Votes )

Given a

Answer :

a = 729

7^th 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

∴ S₇ = 2059

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