Given a G.P. with a = 729 and 7th term 64, determine S7.

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asked Feb 10, 2018 in Mathematics by Rohit Singh (61,782 points) 35 133 354

Given a G.P. with a = 729 and 7th term 64, determine S7.

1 Answer

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answered Feb 10, 2018 by sameer (82,980 points) 5 11 37

a = 729 a7 = 64
Let r be the common ratio of the G.P. It is known that,
an = a rn–1
a7 = ar7–1 = (729)r6
⇒ 64 = 729 r6

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