Question 972645: The probabiltiy that the two digit number formed by digits 1,2,3,4 is divisible by 4, is
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! There are 16 possibilities:
it is 1/4, and the even first number ending in 4 and the odd first number ending in 2 are the ones. Evenly divisible would be a comment I'd make in my answer.
If the answer is 1/5, then there is an issue I have with the wording of the question, which is not surprising, given that "evenly divisible" was omitted. The two digit numbers formed by those digits are listed. There are 90 two digit numbers in all; 23 are divisible by 4. One-fifth is an odd fraction here and would suggest something like 2 out of 10, 3 out of 15 or 4 out of 20. I can see 12, 24, and 32 from a sample of the following 15 {12,16,20,24,28,32,36,40,44,48,52,64,72,84,92} . This is 1/5, but it implies that a digit cannot be repeated, which is not stated in the question. I'm sorry I am unable to take this further. Perhaps someone else can. The numbers below are the way I interpreted the question.
11
12
13
14
21
22
23
24
31
32
33
34
41
42
43
44
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