The question is John has locked a 4 digit combination lock with each of the numbers 0-9. He knows the numbers 1,4,6, appears exactly once, but he does not remember the position of the numbers and he is not sure of what the fourth number is.
The student think the fourth number is the number in the fourth position of the combination lock. He thinks so because people do not say an order of the number you know or not know. So later I wanted him to try again with the right idea. There are two students who thought this way. The students first language is not English. I would let them try again since its not a math issue and would you? Also can it also be interpreted this way?