# Homework Help: How to solve this permutation question

1. Dec 27, 2012

### bllnsr

1. The problem statement, all variables and given/known data
http://i49.tinypic.com/2hoeghs.png

2. Relevant equations

3. The attempt at a solution
(i) 144 ways
(ii) 2!*4!*3!
(iii) 12*5!
these are my answers

2. Dec 27, 2012

### tiny-tim

looks ok

what is worrying you about that?

3. Dec 27, 2012

### bllnsr

are my answers correct?

4. Dec 27, 2012

### Michael Redei

They look correct to me.

5. Dec 27, 2012

### bllnsr

Ok Thanks

6. Dec 30, 2012

### HallsofIvy

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

7. Jan 2, 2013

### bllnsr

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

8. Jan 3, 2013

### hms.tech

Shouldn't the answer to (i) be 1440

5P3 * 4! = 1440

The rest look fine to me.

9. Jan 3, 2013

### haruspex

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

10. Jan 3, 2013

### hms.tech

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