How do we solve this ?

Dear student, lmn = 1 \frac{1}{1 + l + m^{- 1}} + \frac{1}{1 + m + n^{- 1}} + \frac{1}{1 + n + l^{- 1}} = \frac{m}{m + lm + 1} + \frac{1}{1 + m + lm} + \frac{l}{l + \ln + 1} [n^{- 1} = lm] = \frac{m}{m + lm + 1} + \frac{1}{1 + m + lm} + \frac{l}{l + m^{- 1} + 1} [\ln = m^{- 1}] = \frac{m}{m + lm + 1} + \frac{1}{1 + m + lm} + \frac{lm}{lm + 1 + m} = \frac{lm + m + 1}{lm + m + 1} = 1 Regards

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