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If all possible four digit numbers are formed with the digits without repetition and arranged in the ascending order of magnitude, then the position of the number
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First set of numbers will have as the thousands digit.
With three as the thousand's digits, there will be options for hundredth place, options for ten's place and 1 for one's place since repetition is not allowed.
Hence number of -digit numbers starting with are
Similarly for numbers starting with .
So till now , -digits numbers have been counted.
Also similarly there are , -digit numbers starting with .
The last number out of them will have at hundred's place, at ten's place and at unit's place.
Hence is at 18th position.
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| Question Text | If all possible four digit numbers are formed with the digits without repetition and arranged in the ascending order of magnitude, then the position of the number |
| Answer Type | Text solution:1 |
| Upvotes | 150 |
