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15 February, 03:27

A key code must contain 4 numerals. There are 10 numerals available. Using

these numerals, how many different key codes may be created?

O A. 180

B. 210

O C. 3,060

O D. 5,040

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Answers (2)
  1. 15 February, 04:25
    0
    First number can be 1 out of 10

    Second number can be 1 out of 9

    Third number can be 1 out of 8

    Fourth number can be 1 out of 7

    Total combinations = 10 x 9 x 8 x 7 = 5,040

    The answer is D. 5,040
  2. 15 February, 05:01
    0
    B, 210

    Step-by-step explanation:

    there is 10 options for the first one, 9 option for the second, 8 options for the third and 7 for the last. 10*9*8*7=5040, which is d
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