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How many digit mobile numbers can be formed if at least one digit is repeated?
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At least one digit is repeated Total No. digit is repeated
For total permutations,
Any of the digit can be filled by any of the numbers.
Total times
For no digit to be repeated:
Let first digit be any of the numbers,
Next digit can be any of the remaining and so on.....
Required
Hence, the answer is
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| Question Text | How many digit mobile numbers can be formed if at least one digit is repeated? |
| Answer Type | Text solution:1 |
| Upvotes | 150 |
