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UPSC CDS Math Number System Questions
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© examsnet.com
Question : 62
Total: 102
The value of
1
1
×
4
+
1
4
×
7
+
1
7
×
10
+
.
.
.
+
1
16
×
19
is
[2015 CDS-II]
5
19
6
19
8
19
9
19
Validate
Solution:
1
1
×
4
+
1
4
×
7
+
1
7
×
10
+
.
.
.
+
1
16
×
19
=
1
3
(
3
1
×
4
+
3
4
×
7
+
3
7
×
10
+
.
.
.
.
+
3
16
×
19
)
=
1
3
(
4
−
1
1
×
4
+
7
−
4
4
×
7
+
10
−
7
7
×
10
+
.
.
.
+
19
−
16
16
×
19
)
=
1
3
(
1
−
1
4
+
1
4
−
1
7
+
1
7
−
1
10
+
.
.
.
+
1
13
−
1
16
+
1
16
−
1
19
)
=
1
3
(
1
−
1
19
)
=
1
3
×
18
19
=
6
19
© examsnet.com
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