KCET 2018 Math Solved Paper

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Question : 10 of 60
 
Marks: +1, -0
If the vector a
^
i
+
^
j
+
^
k
,
^
i
+b
^
j
+
^
k
and
^
i
+
^
j
+c
^
k
are colpanar (a ≠ b ≠ c ≠ 1) , then the value of abc - (a + b + c) =
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