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If ai+j+k, i+bj+k and i+j+ck are coplana...

If ai+j+k, i+bj+k and i+j+ck are coplanar, then

A

a + b+ c = 0

B

abc = -1

C

a+b+ c = abc +2

D

ab+ bc + ca = 0

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The correct Answer is:
C
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HIMALAYA PUBLICATION-VECTORS AND THEIR APPLICATIONS-QUESTION BANK
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