If the mth term of an A.P. be 1/n and nth term be 1/m, then show that its (mn)th term is 1

If the mth term of an A.P. be 1/n and nth term be 1/m, then show that

1.	If the mth term of an A.P. be 1/n and nth term be 1/m, then show that its (mn)th term is 1
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