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UPSC CDS Math Number System Questions
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© examsnet.com
Question : 52
Total: 102
What is the unit digit of
7
139
?
[2016 CDS-II]
9
7
6
3
Validate
Solution:
The unit digit of
7
n
is 7 or 9 or 3 or 1 when the remainder obtainedon dividing n by 4 is 1 or 2 or 3 or 4, respectively
139
=
4
×
34
+
3
The remainder obtained on dividing 139 by 4 is 3.
So, the unit digit of
7
139
is 3.
© examsnet.com
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