Answer:
1. 2, 6, 18, 54, 162, 486
Rule: times 3
2. 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128
Rule: times 2
3. 1, 4, 16, 64, 256, 1024
Rule: times 4
4. 3, 9, 27, 81, 243, 729
Rule: times 3
How to get the common ratio?
(1. 2, 6, 18, 54, 162, 486)
Divide the second term to the first term (6÷2=3)
Therefore, to get the next sequence, do this way.
2 is the first term, so...
2×3= 6 (The second term)
6×3= 18 (Third term)
18×3= 54 (Fourth term)
54×3= 162 (Fifth term)
162×3= 486 (The sixth or the last term)
1. 2, 6, 18, 54, 162, 486