# Sorry, One More Probability Word Problem!

• Jan 28th 2009, 11:58 AM
glue'd'n'math
Sorry, One More Probability Word Problem!
Ok, this is the last one I have. Could someone please brake probability down to me? This is hopefully the last probability problem.(Crying) -Probability problem #3-

What is the probability that when 3 spinners with the numbers 1-3
are spun, that at least two will land on a prime number?

Thank you very much!
• Jan 28th 2009, 01:54 PM
mr fantastic
Quote:

Originally Posted by glue'd'n'math
Ok, this is the last one I have. Could someone please brake probability down to me? This is hopefully the last probability problem.(Crying) -Probability problem #3-

What is the probability that when 3 spinners with the numbers 1-3
are spun, that at least two will land on a prime number?

Thank you very much!

Same idea as previous questions, although more tedious this time.

List all the possibilities - carefully! (there are 3^3 = 27):

1, 1, 1
1, 1, 2
1, 1, 3

etc. etc.

Now count how many of these have at least two prime numbers (NB: 2 is a prime number).

etc.