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How many numbers are there between 20000 and 30000 in which the digits are 2,3,5,6,7 and each digit can be repeated any number of times.

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Since the numbers are > 20000 and <30000 $1^{st}$ place can be only 2.
Remaining 4 places can be occupied by any of the 5 digits.
$\therefore$ Required no. of numbers = $5^4=625$
answered Aug 20, 2013 by rvidyagovindarajan_1
 

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