what is the probability of A getting chosen from the alphabet ? being a vowel

the vowels are a,e,i,o,u  there are 5 of them.

There is 26 letters altogether so the prob of choosing a vowel is  5/26

out of what number

Out of the whole alphabet, you have a 1/26 chance of getting an "a".

Out of all of the vowels, you have a 1/6 chance of getting an "a".