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UPSC CDS 1 2018 Math Paper
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© examsnet.com
Question : 1
Total: 100
5
17
+
5
18
+
5
19
+
5
20
is divisible by
[2018 CDS-I]
7
9
11
13
Validate
Solution:
5
17
+
5
18
+
5
19
+
5
20
=
5
17
(
1
+
5
+
5
2
+
5
3
)
=
5
17
(
1
+
5
+
25
+
125
)
=
5
17
×
156
Since, 156 is divisible by 13. So,
5
17
+
5
18
+
5
20
is divisible by 13
© examsnet.com
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