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

Let `a, b and c` be distinct non-negative numbers.
If vectos `a hati +a hatj +chatk, hati + hatk and chati +chatj+bhatk` are coplanar,
then c is

A

(a) A.M. of a and b

B

(b) G.M of a and b

C

(c) Sum of a and b

D

(d) H.M. of a and b

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The correct Answer is:
B
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