If the points \[(a,b),\,(a',b')\]and \[(a-a',b-b')\]are collinear, then [RPET 1999]

If the points \[(a,b),\,(a',b')\]and \[(a-a',b-b')\]are collinear, the

1.	If the points \[(a,b),\,(a',b')\]and \[(a-a',b-b')\]are collinear, then [RPET 1999]
A.	\[ab'=a'b\]
B.	\[ab=a'b'\]
C.	\[aa'=bb'\]
D.	\[{{a}^{2}}+{{b}^{2}}=1\]
Answer» B. \[ab=a'b'\]

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If the points \[(a,b),\,(a',b')\]and \[(a-a',b-b')\]are collinear, then [RPET 1999]

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