`(2a^2-1)/a ,4 a-3/a ,(6a^3-5)/a` s of the series Til

(2a^(2)-1)/(n),4a-(3)/(a),(6a^(2)-5)/(a)15. Find the sum of n terms of the series,36a- 5

Find the sum of the series (2a^(2)-1)/(a),4a-(3)/(a),(6a^(2)-5)/(a),...

Let S denote sum of the series 3/(2^3)+4/(2^4 .3)+5/(2^6 .3)+6/(2^7 .5)+oo Then the value of S^(-1) is __________.

Let S denote sum of the series 3/(2^3)+4/(2^4 .3)+5/(2^6 .3)+6/(2^7 .5)+oo Then the value of S^(-1) is __________.

The electronic configuration of an element is 1s^(2), 2s^(2), 2p^(6), 3s^(3), 3p^(6), 3d^(5), 4s^(1) . This represents its :

Let S denote sum of the series 3/(2^3)+4/(2^4 .3)+5/(2^6 .3)+6/(2^7 .5)+ ...... oo Then the value of S^(-1) is __________.

Study the following number series to answer these questions. 2 6 7 5 4 3 7 4 8 9 4 3 2 5 4 7 9 8 6 8 7 1 2 5 3 7 6 8 9 3 6 How many 7's are there in the series which are immediately preceded by an even number and immediately followed by an odd number? 1) 2 2) 4 3) 3 4) 5 5) None of these

The sum of the series 1 + (1)/(3^(2)) + (1 *4)/(1*2) (1)/(3^(4))+( 1 * 4 * 7)/(1 *2*3)(1)/(3^(6)) + ..., is (a) ((3)/(2))^((1)/(3)) (b) ((5)/(4))^((1)/(3)) (c) ((3)/(2))^((1)/(6)) (d) None of these

If S_(1), S_(2), S_(3),….., S_(n) are the sum of infinite geometric series whose first terms are 1,3,5…., (2n-1) and whose common rations are 2/3, 2/5,…., (2)/(2n +1) respectively, then {(1)/(S_(1) S_(2)S_(3))+ (1)/(S_(2) S_(3) S_(4))+ (1)/(S_(3) S_(4)S_(5))+ ........."upon infinite terms"}=