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Dear Vishal,
The m-th term is a+(m-1)d=n and the n-th term is a+(n-1)d=m
Therefore,a+md-d=n and a+nd-d=m
Subtracting the second result from the first result we get
a+md-d-a-nd+d=n-m
this implies,(m-n) d=(n-m)
therefore,d=(-1)
Therefore the p-th term is a+(p-1)d=a+(p-1)(-1)=a-p+1
I Hope I have come to your help.
With Regards,ADHIRAJ
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