1. 1350,=1365-15

2. none

3. 125=

(5C1)*(4c3)=20

(5C2)*(4C2)=60

(5C3)*(4C1)=40

(5C4)=5

Results 1 to 2 of 2

- May 27th 2008, 05:37 PM #1

- Joined
- May 2008
- Posts
- 12

## Help with a question please?

From a box of 15 distinguishable textbooks (5 Engineering, 6 Psychology, 4 Economics), Sarah

closes her eyes and randomly arranges 4 books on a shelf. Let E denote the event that all

books on the shelf are Psychology books, F the event that no Engineering book is selected,

and G the event that at least one book from each subject is selected. Determine the number

of outcomes in the following events:

(a) E^c (E complement)

(b) F U G

(c) E^c U F^c (E complement Union F complement)

- May 30th 2008, 07:40 PM #2

- Joined
- May 2008
- Posts
- 21