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If a, b and c be distinct non negative n...

If a, b and c be distinct non negative numbers. If the vectors ai+aj+ck, i+k and ci+cj+bk lie in a plane, then c is

A

the arithmetic mean of a and b

B

the geometrical mean of a and b

C

the harmonic mean of a and b

D

equal to zero

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The correct Answer is:
B
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