1.

The value of a, for which the points A,B,C with position vectors 2bari- barj+bark, bari-3barj-5bark and abari- 3barj+bark respectively are the verticesof a right angled trianglle with C=pi/2 are

Answer»

2,1
`-2,-1`
`-2,1`
2,-1

Answer :A


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