How can you prove that two different lines can't have more than one point in common?
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so the assumption we started with thattwo lines can pass through two disticntpoint is wrong. Hence, two lines cannothave more than one point in common. Toprove = Lines l1 and l2 have only one point in common. suppose lines l1 and l2 intersect at two disticnt points say P and Q.Then l1 contains points P and Q.
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