Which is a geometric sequence 6, 18, 54, 162 or 3, 6, 9, 12, 15 or 1, 4, 5, 9, 14 or 3, 5, 8, 13, 21

Basically for geometric sequence

an times r=a_ (n+1)

see

6*3=18

18*3=54

54*3=162

yes

3*2=6

6*2=12, it says 9 but should be 12

not a geometric

1*4=4

4*4=16, nope, it says next term is 5,

3*5/3=5

5*5/3=25/3, nope, says next term is 8

geometric sequense is first one

6,18,54,162