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The number of Five digit telephone number having at least one of their digits repeated( supposing no telephone number starts with 0)?
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The number of Five digit telephone number having at least one of their...
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n!=n(n−1)(n−2)(n−3)...(3)(2)(1)

No of numbers with repetition =10X10X10X10X10
⇒100000
No.of numbers without repetition =10X9X8X7X6
⇒30240
∴ No.of numbers with atleast one digit repeated =10,0000−30240
⇒69760
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The number of Five digit telephone number having at least one of their digits repeated( supposing no telephone number starts with 0)?
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