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How many 6-digits telephone numbers can have one or more repeated digits?

Updated: 11/1/2022

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Q: How many 6-digits telephone numbers can have one or more repeated digits?
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What is the number of 5 digit telephone numbers having atleast one of their digits repeated?

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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