model these models

Posted by Shreya Agrawal on Dec 23, 2013; 6:54am
URL: http://discussion-forum.276.s1.nabble.com/model-these-models-tp7584397.html

Out of seven models, all of different heights, five models will be chosen to pose for a photograph. If the five models are to stand in a line from shortest to tallest, and the fourth-tallest and sixth-tallest models cannot be adjacent, how many different arrangements of five models are possible?