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How many different three-digit multiples of 5 can be

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How many different three-digit multiples of 5 can be [#permalink] New post 28 Oct 2007, 13:19
How many different three-digit multiples of 5 can be composed of digits 2, 3, 4, and 5 if none of the digits is repeated?

3
6
10
12
18
Director
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 [#permalink] New post 28 Oct 2007, 13:31
never mind i think i got it.

since we can only use 2,3,4, and 5. units digit must be 5

so for possible combinations of xy5

it would be 235, 325, 245, 425, 345, 435

answer 6
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Re: counting multiple [#permalink] New post 19 Nov 2007, 09:37
GMAT TIGER wrote:
beckee529 wrote:
How many different three-digit multiples of 5 can be composed of digits 2, 3, 4, and 5 if none of the digits is repeated?

3
6
10
12
18


= 3c2 x 2 = 6


can you explain your method. i solved it differently

XYZ, where Z must be 5. therefore 1 variation of digit in Z.
Y can be any of the 3 possible choices.
X can be any of the 2 possible choices.

2+3+1= 6
Re: counting multiple   [#permalink] 19 Nov 2007, 09:37
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