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Q)
Suppose
→
a
=
λ
→
i
−
7
→
j
+
3
→
k
,
→
b
=
λ
→
i
+
→
j
+
2
λ
→
k
. If the angle between
→
a
and
→
b
is greater than
90
∘
,
then
λ
satisfies the inequality:
(
1
)
−
7
<
λ
<
1
(
2
)
λ
>
1
(
3
)
1
<
λ
<
7
(
4
)
−
5
<
λ
<
1
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