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UPSC CDS 1 2020 Math Paper
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© examsnet.com
Question : 50
Total: 100
If
(
x
8
+
1
x
8
)
=
47
what is the value of
(
x
6
+
1
x
6
)
?
36
27
18
9 .
Validate
Solution:
👈: Video Solution
x
8
+
1
x
8
=
7
⇒
x
4
+
1
x
4
=
√
47
+
2
=
7
⇒
x
2
+
1
x
2
=
√
7
+
2
=
3
⇒
x
6
+
1
x
6
=
(
3
)
3
−
3
(
3
)
=
18
© examsnet.com
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