# math30

posted by .

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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