Let A(1,1),B(7,3) and C(3,6) are the vertices of a ΔABC. If D is the mid-point of BC and AL is the altitude of the triangle along BC, then the product of slopes of AD and AL is
A
67
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B
−67
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C
76
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D
−76
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Solution
The correct option is C76 The coordinate of D =(7+32,3+62)=(5,92)