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UPSC CDS Math Number System Questions
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© examsnet.com
Question : 7
Total: 102
What is the digit in the unit’s place of the number represented by
3
98
—
3
89
?
[2019 CDS-II]
3
6
7
9
Validate
Solution:
Unit digit of
(
3
18
−
3
89
)
=
Unit digit of
(
3
96
−
3
2
−
3
88
−
3
)
=
Unit digit of
(
1
×
9
−
1
×
3
)
=
6
© examsnet.com
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