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The value of a, for which the points A, B, C with position vectors 2ˆiˆj+ˆk,ˆi3ˆj5ˆk and aˆi3ˆjˆk respectively are the vertices of a right angled triangle with C=π2 are :


( A ) 2 and 1
( B ) -2 and -1
( C ) 2 and -1
( D ) -2 and 1

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