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UPSC 2015 CDS I Math Paper
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© examsnet.com
Question : 5
Total: 100
The digit in the units place of the product
81
×
82
×
83
×
84
×
.
.
.
×
99
is
[2015 CDS-I]
0
4
6
8
Validate
Solution:
81
×
82
×
83
×
84
×
.
.
.
.
×
90
×
91
×
.
.
.
×
99
=
(
81
×
82
×
83
×
84
×
.
.
.
×
9
×
91
×
.
.
.
×
99
)
×
10
Any number multiplied by 10 ends in 0.
Thus, the digit in the units place of the given product is 0.
Trick:
If the unit digit of a number A is 0,then unit digit of any number obtained by multiplication with Ais zero.
© examsnet.com
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