# Thread: Not good with probabilities.

1. ## Not good with probabilities.

Find the probability of selecting three of the vowels a, e, i, o, u out of the alphabet when three letters are selected at random.

2. ## Re: Not good with probabilities.

Hello, alexgintom!

Find the probability of selecting three of the vowels a, e, i, o, u out of the alphabet
when three letters are selected at random.

I will assume the selections are made without replacement.

There are: . $_{26}C_3 \:=\:{26\choose3} \:=\:2600$ possible outcomes.

There are: . $_5C_3 \:=\:{5\choose3} \:=\:10$ ways to get 3 vowels.

Therefore: . $P(\text{3 vowels}) \:=\:\frac{10}{2600} \:=\:\frac{1}{260}$

3. ## Re: Not good with probabilities.

Hi, no need to be worried if you are not good in probability, even I was too not good in probability but nowadays there lots of online tutor is available so you can easily go for that and make your concept clear.