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If the vectors ai + j + k, i + bj + k and i + j +ck (a, b, c ≠ 1) are coplanar, then the value of 1/(1− a) + 1/(1− b) + 1/(1− c) is equal to

+2 votes
in JEE by kratos

If the vectors ai + j + k, i + bj + k and i + j +ck (a, b, c ≠ 1) are coplanar, then the value of 1/(1− a) + 1/(1− b) + 1/(1− c) is equal to

A. 0

B. 1

C. a + b + c

D. abc

1 Answer

+1 vote
by kratos
 
Best answer

Correct option B. 1

Explanation:

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