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Question: The points $(at_{1}^{2},2a{{t}_{1}}),(at_{2}^{2},2a{{t}_{2}})$and $(a,0)$will be collinear, if



1) ${{t}_{1}}{{t}_{2}}=1$
2) ${{t}_{1}}{{t}_{2}}=-1$
3) ${{t}_{1}}+{{t}_{2}}=1$
4) ${{t}_{1}}+{{t}_{2}}=-1$
Solution: Explanation: No Explanation
Concurrency of three lines

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