Question

PLEASE HELP 25 POINTS

Answer 1

Answer:

 an= n * (n+1)

Step-by-step explanation:

2,6,12,20,.....

6-2 =4

12-6 = 6

So there is no common difference because these numbers are not the same

It cannot be an arithmetic difference

6/2 =3

12/6 =2

So there is no common ratio because these numbers are not the same

It cannot be geometric

2,     6,      12,     20,...

   +4      +6    +8     +10

a1 =2

a2 =2*3

a3 = 2*6=2*2*3=3*4

a4=2*10=2*2*5=4*5

.....

a5 = 5*6 = 30

 an= n * (n+1)