Which is the greatest four digit number can be made using the digits 4, 5, 6 and 0 without repetition?
A
5640
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B
6045
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C
6450
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D
6540
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Solution
The correct option is D6540
To obtain the greatest 4 digit number; put the greatest number at the extreme left, then put the remaining digits in descending order of their values with 0 at the end. Therefore, the greatest number is 6540.