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Tapasranjan Das Grade: 12
        

Q:- The coplanar points A,B,C,D are (2-x,2,2) , (2,2-y,2) ,(2,2,2-z) and (1,1,1) respectively. Then


A. 1/x+1/y+1/z =1


B. x+y+z=1


C. 1/(1-x) +1/(1-y) +1/(1-z) =1


D. None of these

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear Tapasranjan


this question can be solved easly by using equation of pane passing through 3 points in determinant form


use determinant form of plane passing trough ((2-x,2,2) , (2,2-y,2) ,(2,2,2-z)


and this plane also passes through (1,1,1) so it will satisfy this point also


put it and simplify




7105-489_7662_untitled.JPG


now open determenant


1/x  + 1/y  + 1/z =1


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Badiuddin

7 years ago
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