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Let \( T_{r} \) be the \( r^{\text {th }} \) term of an A.P. for \( r=1,2,3, \ldots \). . If for
\( \mathrm{P} \) some positive integers \( m, n \) we have \( \mathrm{T}_{\mathrm{m}}=\frac{1}{\mathrm{n}} \) and

W) \( \mathrm{T}_{\mathrm{n}}=\frac{1}{\mathrm{~m}} \), then \( \mathrm{T}_{\mathrm{mn}} \) equals
(a) \( \frac{1}{\mathrm{mn}} \)
(b) \( \frac{1}{\mathrm{~m}}+\frac{1}{\mathrm{n}} \)
(c) 1
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