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math30

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The number of three digit or four digit even numbers that can be formed from the numbers 2, 3, 5, 7 is

A.72
B.120
C.144
D.5040

  • math30 - ,

    Question:

    Can digits be repeated,
    e.g. is 332 allowed as a 3 digit number?

    both groups must end with a "2"

    I will assume digits may repeat
    number of 3 digit even numbers = 4x4x1 = 16
    number of 4 digit even numbers = 4x4x4x1 = 64
    total = 80

    mmhhh?

    suppose we can't repeat
    3digit evens = 3x2x1
    = 6
    4digit evens = 3x2x1x1 = 6
    that would be only 12 total

    something is not right with your choices.
    Am I reading the question correctly?

  • math30 - ,

    Reiny I just realized "even meter" means not repeated.

    That help????

  • math30 - ,

    Reiny I just realized "even numbers" means not repeated.

    That help????

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