Hi,

how many four-character codes can be formed if the first character is a nonzero digit, 

the second character is any digit, and the third and fourth characters are uppercase letters of the alphabet, 

and repetition of digits and letters is allowed.

 9*10*26*26



multiple choice exam has five questions and each question has four choices:

In how many ways can the exam be completed? 4^5

 

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