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If a(1),a(2),a(3),.. from a G.P. with co...

If `a_(1),a_(2),a_(3),..` from a G.P. with common ratio r, find in terms of r and `a_(1)` the sum of `a_(1)a_(2)+a_(2)a_(3)+...+a_(n)+a_(n+1)`

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The correct Answer is:
`(r(r^(2n)-1))/(r^(2)-1)a_(1)^(2)`
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