Mathematics
The total number of 4-digit numbers is
9000
9999
10000
none of these
Number System
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Answer
The greatest 4-digit number = 9,999.
The smallest 4-digit number = 1,000.
Total number of 4-digit numbers = 9,999 - 1,000 + 1
= 9,000.
Hence, option 1 is the correct option.
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