Q.The value of 'a' for which the points A,B,C with position vectors ˆ ˆ ˆ 2i j k − +, ˆ ˆ ˆ i 3j 5k − −, ˆ ˆ ˆ ai – 3j k + and respectively are the vertices of right- angled triangle with ∠ ∠ ∠C = 2 π, are:
Correct answer: 2 and 1
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