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प्रश्न
Count the numbers between 999 and 10000 subject to the condition that there are at least one of the digits is repeated
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उत्तर
At least one of the digits is repeated:
Required number of 4 digit numbers = Total number of 4 digit numbers – Number of 4 digit numbers when no digit is repeated
= 9000 – 4536
= 4464
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