Which ones are arithmetic, geometric, or neither sequences?

1, 2 , 4 , 7
0, 2 , 4 , 6
-3, 0, 3, 6
6, 12, 24, 48
20, 22.5 ,25, 27.5
-4, 5, -6, 7
7, 9 , 12 , 14
18, 10 ,2 ,-6
100, 50, 25, 12.5
-1, 3, -9, 27

C

Step-by-step explanation: I GOT IT right on my exam 12th grade

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.

idk

step-by-step explanation: