For each geometric progressions find the...

For each geometric progressions find the common ratio 'r'. And then find `a_(n)`.
(i) `3,3/2, 3/4, 3/8`,……
(ii) `2,-6, 18, -54`
(iii) `-1,-3,-9, -27`,…..
(iv) `5,2, 4/5, 8/25`,…..

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The correct Answer is:

`r=3;" "a_(n)=3(3)^(n-1)`

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