Let a,b,c be distinct non-negative numbe...

Let `a,b,c` be distinct non-negative numbers. If the vectors `ahati+ahatj+chatk, hati+hatk` and `chati+chatj+bhatk` lies in a plane then `c` is

the A.M of a and b

the G.M of a and b

the H.M of a and b

equal to zero

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