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. If the sum to infinity of the series 2 + (2 - d)2/3 + (2 + d) 4/9 + (2+ 3d) 8/27 + D.. is 5/2, what is the value of d?
(1) 7/12 (2) -7/12 (3) -5/12 (4) 5/12

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TCS Other Question

If [log101] + [log102] + [log103] + [log104] + ...... + [log10n] = n, where [x] denotes the greatest integer less than or equal to x, then
(1) 96 ≤ n < 104 (2) 104 ≤ n < 107 (3) 107 ≤ n < 111 (4) 111 ≤ n < 116
could u plz explain the below ques. clearly... i found te answer in cat paper but it was not clear....