1.

Let a, b, c be distinct non-negative numbers. If the vectors ahat(i)+ahat(j)+chat(k),hat(i)+hat(k),chat(i)+chat(j)+bhat(k) lie in a plane, then C is

Answer»

A.M. of a, B
G.M. of a, b
H.M. of a, b
zero

Answer :B


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