English has 6 letters that can be vowels. this includes y, which can be either a consonant or a vowel; for this problem, we'll consider y a vowel. the other 20 english letters are always consonants. how many two-letter "words" can we make from these letters if we are required to use at least one vowel? (we aren't limited to words that have an actual meaning in english. thus, for this problem, we'll include nonsense "words" like aa, qo, xy, and uz.)

x=4

step-by-step explanation:

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.