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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 ,show that `a_1b_2=a_2b_1`.

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`therefore` `a_1b_2=a_2b_1`
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