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Find the sum of 10 terms of a GP whose 8th term is 768 and the common ratio is 2.

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Find the sum of 10 terms of a GP whose 8th term is 768 and the common ratio is 2.

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t8 = 768

= ar7

r = 2

t10 = ar9 

= ar7 × r × r

= 768 × 2 × 2

= 3072

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