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beckee529
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
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I don't get why the combination is multiplied by two? i solved by writing out the different possibilities
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beckee529
How many distinct three-digit positive multiples of 5 can be formed from the digits 2, 3, 4, and 5 without repeating any digit?

A. 3
B. 6
C. 10
D. 12
E. 18

The units digit must be 5 for the number to be a multiple of 5: _ _ 5. This leaves us with three choices for the hundreds digit: 2, 3, or 4. Subsequently, we're left with two choices for the tens digit. Therefore, we can form 3*2 = 6 such numbers.


Answer: B
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Ways to arrange numbers
2,3,4 : 3!
Last digit has to be 5
3!*1
Option B


beckee529
How many distinct three-digit positive multiples of 5 can be formed from the digits 2, 3, 4, and 5 without repeating any digit?

A. 3
B. 6
C. 10
D. 12
E. 18

Posted from my mobile device
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