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If the points (a1,\ b1),\ \ (a2,\ b2) an...

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` .

A

`a_1b_2=a_2b_1`

B

`a_1+a_2=b_1+b_2`

C

`a_2b_2=a_1 b_1`

D

`a_1+b_1=a_2+b_2`

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The correct Answer is:
A
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