KEAM 2011 Math Paper

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Question : 21 of 120
 
Marks: +1, -0
If
−
a
=2
⋀
i
−7
⋀
j
+
⋀
k
and
−
b
=
⋀
i
+3
⋀
j
−5
⋀
k
and
−
a
.m
−
b
=120
,
then the value of m is equal to
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