Select the favorable outcomes for rolling exactly one three.

a.(1-1) (2-2) (3-3) (4-4) (5-5) (6-6)
b.(1-3) (2-3) (3-1) (3-2) (3-4) (3-5) (3-6) (4-3) (5-3) (6-3)
c.(5-1) (5-2) (5-3) (5-4) (5-5) (5-6)
d.(1-6) (2-5) (3-4) (4-3) (5-2) (6-1)

C

Step-by-step explanation:

If it's asking for a single three then that's exactly what you're looking for in the favorable outcome

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.