A.P.

Asked by  | 4th Apr, 2008, 02:17: PM

Expert Answer:

Sum to n terms=n/2  (2+(n-1)d)=0

                      (2+(n-1)d)=0.......

                      d=-2/1-n

Sum to m terms= m/2 (2+(m-1)d)

                          Substitute the value of d in the above expression....

Sum to m terms= m(m-n) /1-n=m(m-n/1-n)

 

Ans: (d)  None

Answered by  | 4th Apr, 2008, 05:39: PM

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