KEAM 2021 Math Solved Paper

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Question : 30 of 120
 
Marks: +1, -0
If
→
a
=
^
i
+λ
^
j
−2
^
k
,
→
b
=2
^
i
−3
^
j
+5
^
k
and
→
a
.
→
b
=−20
, then the value of λ is equal to
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