Give an example of two permutations of the same n labels 0; 1; : : : ; n 1 that cannot be inorder and postorder traversal lists of the same binary tree.

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

How do you use the elimination method for this question? explain, because i really want to understand!

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?