Mathematics
Write the greatest 4-digit number of four different digits.
Number System
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Answer
The digits available are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Thousands digit: The largest digit is 9.
Current digits used: {9}
Hundreds digit: From the remaining digits, the next largest is 8.
Current digits used: {9, 8}
Tens digit: From the remaining digits, the next largest is 7.
Current digits used: {9, 8, 7}
Units digit: From the remaining digits, the next largest is 6.
Current digits used: {9, 8, 7, 6}
Combining these digits in order, the greatest 4-digit number with four different digits is 9876.
Hence, the greatest 4-digit number with four different digits is 9,876.
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