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Count the numbers between 999 and 10,000...

Count the numbers between 999 and 10,000 subject to the condition that there are .
(i) no restriction .
(ii) no digit is repeated .
(iii) at least one of the digits is repeated .

Text Solution

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The correct Answer is:
(i) 9000 (ii) 4536
(iii) 4464
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