1.

The value of a, for which the points A, B, C with position vectors 2hat(i)-hat(j)+hat(k),hat(i)-3hat(j)-5hat(k),ahat(i)-3hat(j)+hat(k) respectively are the vertices of a right angled triangle with C=(pi)/(2)are

Answer»

1
2
-1
-2

Answer :A::B


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