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How many ways of choosing four different characters out of your username are there? Note: include the decimal as a character that you can choose.
How many ways of choosing four different characters out of your username are there? Note: include the decimal as a character that you can choose. Hint: Be careful of characters that are identical. In your explanations, identify the counting method you are using and why you choose this method. You must also show all your steps and explain your work.
USERNAME ashley.holt
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