Rishad

12-25-2002, 03:29 AM

Hi guys, does anyone have a way to do these? thanks.....

1. Out of 7 models, all of different sizes, 5 models will be chosen to pose for a photograph. If the 5 models are to stand in a line from shortest to tallest, and the 4th-tallest and 6th-tallest models can't be adjacent, how many different arrangements are possible?

6

11

17--- this is correct but don't know why

72

210

2. If you have 5 square picture frames, all of varying sizes, and you want to hang them on a wall in a row, how many combinations exist such that the two largest frames are never next to each other?

1. Out of 7 models, all of different sizes, 5 models will be chosen to pose for a photograph. If the 5 models are to stand in a line from shortest to tallest, and the 4th-tallest and 6th-tallest models can't be adjacent, how many different arrangements are possible?

6

11

17--- this is correct but don't know why

72

210

2. If you have 5 square picture frames, all of varying sizes, and you want to hang them on a wall in a row, how many combinations exist such that the two largest frames are never next to each other?