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For each geometric progressions find the common ratio 'r'. Andthen 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,…..

Answer»


Answer :(i) `r=1/2, a_(N) = 3(1/2)^(n-1)`,
(II) `r=-3, a_(n) = 2(-3)^(n-1)`
(iii) r=3; `a_(n) =(-1)(3)^(n-1)`
(iv) `r= 2/5; a_(n) = 5(2/5)^(n-1)`


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