This is very easy question. no any confusion should be there. Earlier, I also thought that answer might be 2 as I was reasoning that if array were 1 sorted, then suppose element value 3 could be at positions 2nd or 4th. but, the question is asking something else.
correct procedure to solve this question is:
question is saying that array is 2 sorted as well as 3 sorted means the array is 2 sorted.
let us consider array with N = 3.
2 1 4 3 6 5 the array is 1 sorted.
now, pick any element from above array let us say we are picking element 3, it might at position 3rd not at 5th position starting from beginning because if element 3 if it would be at position 5th , then the resulting array would not be 1 sorted. that's why it might be at position 3rd.Therefore, maximum positions element can be, is one.
See, easy question, na. very easy question. nothing to panic. read question patiently. You'll definitely solve the answer.