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21. If the mth term of an A.P. is 1/n and the nth term is 1/m, then prove that the sum of first mn terms is 1/2(mn+1)

Answer» 21. If the mth term of an A.P. is 1/n and the nth term is 1/m, then prove that the sum of first mn terms is 1/2(mn+1)


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