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CAT 2020 Exam Shift 3 Solved Paper
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© examsnet.com
Question : 66
Total: 76
How many integers in the set
{
100
,
101
,
102
,
ldots
,
999
}
have at least one digit repeated?
Your Answer:
Validate
Solution:
The given set is a set of all three-digit numbers and the number of numbers in the set
=
900
.
The number of three-digit numbers having no digits repeating
=
9
×
9
×
8
=
648
Required answer
=
900
−
648
=
252
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