How Many Ways Can You Solve This Permutation Problem?

[bllnsr]

Homework Statement

http://i49.tinypic.com/2hoeghs.png

Homework Equations

The Attempt at a Solution

(i) 144 ways
(ii) 2!*4!*3!
(iii) 12*5!
these are my answers

 

[tiny-tim]

looks ok

what is worrying you about that? ​

 

[bllnsr]

are my answers correct?

 

[Michael Redei]

They look correct to me.

 

[bllnsr]

Ok Thanks

 

[HallsofIvy]

Generally, for 'The Attempt At A Solution' you should show what you actually did, not just list the answers.

 

[bllnsr]

@HallsofIvy
sorry for that next time I will post my full attempt.

 

[hms.tech]

Shouldn't the answer to (i) be 1440

5P3 * 4! = 1440

The rest look fine to me.

 

[haruspex]

Shouldn't the answer to (i) be 1440

5P3 * 4! = 1440

The rest look fine to me.

No, it's 4!3!. How do you get 1440?

 

[hms.tech]

I think you right, I made a mistake understanding the question .
Thanks