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Mathematics 18 Online
OpenStudy (anonymous):

The letters ABCDEFGH are to be used to form strings of length 5. How many strings contain the letter A if repetitions are allowed?

OpenStudy (anonymous):

How many 5 letter strings don't contain A?

OpenStudy (anonymous):

\(|\{A, B, C, D, E, F, G, H\}^5| - |\{B, C, D, E, F, G, H\}^5| = 8^5 - 7^5 \)

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