Many online portals now use 2-Factor Authentication. After you login with your username and password, a code is sent to your phone and you have to enter this code. Assume this code is six digits long. What is the likelihood that this code will consist of at least one repeated digit? (zero is a valid digit, meaning an authentication code could consist of all zeroes. Here are examples of authentication codes with repeated digits – 000000, 154443, 112339, 556688). Please show how you would do this in excel, thank you

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