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5 digit telephone numbers having at least one of their digits repeated is

= total possible 5 digit telephone numbers - 5 digit telephone numbers without any digit being repeated.

=(10*10*10*10*10)-(10*9*8*7*6)

=100000-30240

=69760

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โˆ™ 2012-02-06 18:35:52
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Q: What is the number of 5 digit telephone numbers having atleast one of their digits repeated?
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