# New Probability question

• Jul 15th 2009, 06:35 AM
audiras
New Probability question
Let S be the sample space where S= {1,2,3,4,5,6,7,8,9,10} suppose that the outcomes are equally likely. COmpute the probability of the event E= {1,2,3} ?

Let P(A) =.25 P(B)=.45 and the P(A&B)=.15 Find P(A or B)?

How many different words can be formed using all the letters in the word MISSING?
• Jul 15th 2009, 06:47 AM
mr fantastic
Quote:

Originally Posted by audiras
Let S be the sample space where S= {1,2,3,4,5,6,7,8,9,10} suppose that the outcomes are equally likely. COmpute the probability of the event E= {1,2,3} ? Mr F says: Does the order matter?

Let P(A) =.25 P(B)=.45 and the P(A&B)=.15 Find P(A or B)? Mr F says: Substitute the given data into a formula that you're expected to know and that will surely be in your notes. Where are you stuck?

How many different words can be formed using all the letters in the word MISSING? Mr F says: This is a 'permutations with repeated elements' problem. Where are you stuck?

..
• Jul 15th 2009, 06:50 AM
Plato
Quote:

Originally Posted by audiras
Let S be the sample space where S= {1,2,3,4,5,6,7,8,9,10} suppose that the outcomes are equally likely. COmpute the probability of the event E= {1,2,3} ?

Let P(A) =.25 P(B)=.45 and the P(A&B)=.15 Find P(A or B)?

Those two questions are so easy and basic, what have you done for yourself?
At least, tell us what you don't understand about the questions.