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n digit string of length n over alphabet {0,1, . . . ,9} a. How many...

n digit string of length n over alphabet {0,1, . . . ,9}

a. How many n digit strings are there with at least one 1?

b. many n digit are there with EXACTLY one 1?

PLEASE ANSWER BOTH AND INCLUDE THE FACT THAT THE STRING IS OVER ALPHABET {0,1,2,3,4....9}

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