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If the vectors vec r(1) = ai+j+k, vec r(...

If the vectors `vec r_(1) = ai+j+k, vec r_(2) = i + bj + k, vec r_(3) = i + j + ck ( a ne 1, b ne 1, c ne 1)` are coplanar then the value of `1/(1-a) + 1/(1-b) + 1/(1-c) = `

A

minus 1

B

0

C

1

D

none of these

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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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