X, Y and Z are 3 distinct even integers ranging from 1 to 25. Which of the following is necessarily true?
1. XY/Z is an even integer.
2. 17XY3 is an even integer
3. 8 YX/Z is an even integer
4. 3Y(ZX) is an even integer
Only 2 and 4 are true because they are multiple of 2
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