Question

Which sequence isn’t a geometric progression? A. 2,6,18,54 B. 3,6,9,12 C. 4,8,16,32 D. 1,5,25,125

Answer 1

Answer:

Step-by-step explanation:

B is not geometric progression as the ratio of second number to first number , third to second, fourth to third etc is not same

In a gp the ratio must be same

Answer 2

Answer:

B

Step-by-step explanation:

R1  = 2/6= 6/18 = 18/54 = 1/3

R3 = 4/8 =  8/16  = 16/32 = 1/2

R4 = 1/5 = 5/25 = 25/125 = 1/5

they are in G.P as their common ratio is same

But in option B

3/6 = 1/2

6/9 = 2/3

9/12 = 3/4

There is no common ratio

So they are not in G.P .