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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
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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