Mathematics

John is choosing a password for his access to the internet. He decided not to use the digit 0 or the
letter M. Each letter or number may be used more than once. How many passwords of 2 letters followed
by 4 digits are possible?
A.3,100,625
B.3,100,500
C.4,100,625
D.4,200,625

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  1. 25 letters allowed for first spot
    25 for second spot
    so
    625 letter combinations

    9 digits
    9*9*9*9 = 9^4
    so
    625*9^4 = 4,100,625

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