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CBSE XII
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Math
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Q)
The scalar product of the vector
→
a
=
ˆ
i
+
ˆ
j
+
ˆ
k
with a unit vector along the sums of vectors
→
b
=
2
ˆ
i
+
4
ˆ
j
−
5
ˆ
k
and
→
c
=
λ
ˆ
i
+
2
ˆ
j
+
3
ˆ
k
is equal to one. Find the value of
λ
and hence find the unit vector along
→
b
+
→
c
3
ˆ
i
7
+
6
ˆ
j
7
−
2
ˆ
k
7
4
ˆ
i
7
+
6
ˆ
j
7
−
2
ˆ
k
7
2
ˆ
i
7
+
6
ˆ
j
7
−
ˆ
k
7
3
ˆ
i
7
−
3
ˆ
j
7
−
2
ˆ
k
7
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