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If the points (a1,b1) (a2,b2) and (a1+a2...

If the points `(a_1,b_1) (a_2,b_2) and (a_1+a_2,b_1+b_2)` are collinear, then show that `a_1b_2=a_2b_1`

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The correct Answer is:
`a_2b_1`
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