a. 6 12 18 24
Not geometric because there is not a common ratio between terms
It appears the the common difference is 6
This leads us to believe that "C" might be correct
Check :
First term = 6(1 - 1) + 6 = 6
Second term = 6(2 - 1) + 6 = 6 +6 = 12 yep.....that's the correct one !!!
b. 2 14 98 686
We have a common ratio of 14 / 2 = 7 [ check GM that 98/14 is the same ratio ]
This is geometric
Pretty sure that "A" is correct
First term = 2 (7) ^(1 - 1) = 2*7^0 = 2
Second term 2(7)^(2 - 1) = 2*7^1 = 14
Yep.....that's correct, too
Well....not much mystery to
c. 160 80 40 20
Must be "B"