If the M term of an A.P is 1/N and the N term is 1/M, show that the sum of MN term is 1/2(MN+1)

If the M term of an A.P is 1/N and the N term is 1/M, show that the su

1.	If the M term of an A.P is 1/N and the N term is 1/M, show that the sum of MN term is 1/2(MN+1)
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