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CBSE Class 11-science Answered

A.P.
Asked by | 04 Apr, 2008, 02:17: PM
answered-by-expert 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 | 04 Apr, 2008, 05:39: PM
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