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RRB Junior Engineer Stage 1 Model Papers 3
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© examsnet.com
Question : 14
Total: 100
If
p
q
=
r
s
=
t
u
=
√
5
, then what is the value of
[
(
3
p
2
+
4
r
2
+
5
t
2
)
(
3
q
2
+
4
s
2
+
5
u
2
)
]
?
1/5
5
25
60
Validate
Solution:
Here
p
q
=
r
s
=
t
s
=
√
5
1
then,
(
3
p
2
+
4
r
2
+
5
t
2
)
(
3
q
2
+
4
s
2
+
5
u
2
)
=
3
×
(
√
5
)
2
+
4
×
(
√
5
)
2
+
5
×
(
√
5
)
2
3
×
(
1
)
2
+
4
×
(
1
)
2
+
5
×
(
1
)
2
=
3
×
5
+
4
×
5
+
5
×
5
3
×
1
+
4
×
1
+
5
×
1
=
15
+
20
+
25
3
+
4
+
5
=
60
15
=
5
© examsnet.com
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