Posted by **ophelia** on Thursday, March 24, 2011 at 1:09pm.

a box contains 40 computer disks, 5 are defective. Three disks are selected from the box without replacement and regard to order. what is the probability that

a. all three of the disks are defective

b. none of the three disks are defective

c. exactly one of the three disks is defective

d. at least one of the three disks works

## Answer this Question

## Related Questions

- statistics - A manufacturer of computer disks has a historical defective rate of...
- math - Numbered disks are placed in a box and one disk is selected at random. ...
- Math Finite - A box contains 15 pens of which 4 are defective. A random sample ...
- math - two computer disks and three notebooks cost $17 however, five computer ...
- Finite Math - A box contains two defective Christmas tree lights that have been ...
- Statistics - A box contains 12 lights bulbs, of which 4 are defective. All bulbs...
- Probability again - A box contains 6 red balls, 4 blue balls, and 2 green balls...
- statistics - Media Disk, Inc. duplicates over a million 3.5” floppy disks each ...
- Probabilities - Need some help please! A box contains four good light bulbs and ...
- algebra - If there are 8 red disks numbered 1 through 8, and 6 yellow disks ...

More Related Questions