4.(5.2) how many arrangements of 26 letters of the alphabet are there in which: (1) there is no restriction? (2) d is immediately followed by e, and r is immediately followed by y? (3) a, b, c, d and e appear in the alphabetical order? c

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?