Solve this following

Question:

If the points $\mathrm{A}(\mathrm{a}, 0), \mathrm{B}(0, \mathrm{~b})$ and $\mathrm{C}(1,1)$ are collinear, prove that $\frac{1}{\mathrm{a}}+\frac{1}{\mathrm{~b}}=1$.

Solution:

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