Smilebuffalo
Member
Hey guys i fail at this topic. Need some help in figuring out how these questions are done. Much appreciated ![cry :cry: :cry:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
23. Find the number of arrangements of the letters in the word pencils if:
i) e precedes i (answer = 2520)
ii) there are 3 letters between e and i (answer = 720)
28. A car can hold 3 people in the front seat and 4 in the back seat. In how many ways can 7 people be seated in the car if 2 particular people must sit in the back seat and 1 particular person is the driver? (answer = 288)
29. In how many ways can 4 people be accommodated if there are 4 rooms available? (answer = 256) <--- how come the answer isn't simply 4P4?
33. In how many ways can 5 men and 5 women be arranged in a circle so that the men are separated? In how many ways can this be done if two particular women must not be next to a particular man? (answer = 2880; 864)
23. Find the number of arrangements of the letters in the word pencils if:
i) e precedes i (answer = 2520)
ii) there are 3 letters between e and i (answer = 720)
28. A car can hold 3 people in the front seat and 4 in the back seat. In how many ways can 7 people be seated in the car if 2 particular people must sit in the back seat and 1 particular person is the driver? (answer = 288)
29. In how many ways can 4 people be accommodated if there are 4 rooms available? (answer = 256) <--- how come the answer isn't simply 4P4?
33. In how many ways can 5 men and 5 women be arranged in a circle so that the men are separated? In how many ways can this be done if two particular women must not be next to a particular man? (answer = 2880; 864)