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26 November, 21:17

A password is 4 characters long and must consist of 3 letters and 1 of 10 special characters. If letters can be repeated and the special character is at the end of the password, how many possibilities are there?

a. 175,760

b. 456,976

c. 703,040

d. 1,679,616

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Answers (2)
  1. 26 November, 23:50
    0
    Can be repeated

    26 letters

    3 places

    26*26*26

    10 characters

    26*26*26*10=175760 posibiities

    A
  2. 27 November, 00:16
    0
    Hello,

    number of letters:26

    In each 3 first position, we can put 26 possibilities

    =>26^3

    Last position: 10 posibilities

    ==>26^3*10 = 175 760

    Answer A
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