### 15 Mar

**By**pradeep**In**Question of The Day**Comments**5

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raghav shukla June 25, 2011 at 11:14 am

0

sujit gupta June 25, 2011 at 2:34 pm

easiest question………….just use da concept 1+2+3+ . . . +n=n(n+1)/2

nd similarly for 1^2+2^+3^+…….n^…..nd for da cubes

Ayush Gogia June 28, 2011 at 1:30 pm

answer is 0.

manas August 31, 2011 at 10:36 am

substitue n=1 in (det a)you will get some answer in terms of ‘a’—(1) and substitute n=1 in the 4 options given[A,B,C,D]. the option which satisfies (1) is the correct answer.if two options satisfy (1) then substitute n=2 then one option will be eliminated.

NOTE:ITS JUST A TRICK TO SOLVE THE PROBLEM BUT NOT THE PROCEDURE.

chandana January 14, 2012 at 2:46 pm

n(n+1)/2