Question 18
Amelia wrote down a sequence of consecutive positive integers, erased one integer, and scrambled the rest, leaving the sequence below. What integer did she erase?
$$
6,12,1,3,11,10,8,15,13,9,7,4,14,5,2
$$
$$
6,12,1,3,11,10,8,15,13,9,7,4,14,5,2
$$