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CBSE XII
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Math
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Q)
If
→
a
=
ˆ
i
−
ˆ
j
+
7
ˆ
k
and
→
b
=
5
ˆ
i
−
ˆ
j
+
λ
ˆ
k
,then find the value of
λ
,so that
→
a
+
→
b
and
→
a
−
→
b
are perpendicular vectors.
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