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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