1.

If `(a, 0), (0, b)` and `(1, 1)` are collinear, what is `(a+b-ab)` equal to ?A. 2B. 1C. 0D. `-1`

Answer» Correct Answer - C
Since, `(a, 0), (0, b)` and `(1, 1)` are collinear.
`:. |(a,0,1),(0,b,1),(1,1,1)|=0`
`implies a(b-1)+1(0-b)=0`
`implies ab-a-b=0`
`implies ab-a-b=0`
`implies a+b-ab=0`


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