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UPSC NDA I 2018 Mathematics Solved Paper

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Question : 69 of 120
 
Marks: +1, -0
If
→
a
+2
→
b
+3
→
c
=0 and
→
a
×
→
b
×
→
c
+
→
c
×
→
a
=λ(
→
b
×
→
c
)
then what is the value of λ
[NDA I 2018]
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