If aî + ĵ + k̂, î + b ĵ + k̂, î + ĵ + ck̂ (a ≠ b ≠ – McqOptions

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1.	If aî + ĵ + k̂, î + b ĵ + k̂, î + ĵ + ck̂ (a ≠ b ≠ c ≠ 1) are co-plananr, then the value of \(\frac {1}{1 - a}+\frac {1}{1 - b}+\frac {1}{1 - c}\) is
A.	-1
B.	-1 / 2
C.	1 / 2
D.	1
Answer» E.

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