Question 841909
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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