**Question:****What happens when k _{1} = k_{2} in equation,**

**Mathematically, it is clear that we get an undefined answer, so we need to develop another way to evaluate the expression in the limit when k _{1} approaches k_{2} . (Hint: Consider I‘Hôpital’s rule.)**

**This is the problem 2.19 of the book "Chemical Kinetics and Reaction Dynamics, written by Paul L. Houston".**

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