If the three points $(1,a,b),$ $(a,2,b),$ $(a,b,3)$ are collinear, what is the value of $a + b$?
Question:
If the three points $(1,a,b),$ $(a,2,b),$ $(a,b,3)$ are collinear, what is the value of $a + b$?
Answer:
Let's think step by step.

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If the three points $(1,a,b),$ $(a,2,b),$ $(a,b,3)$ are collinear, what is the value of $a + b$?
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