differences: -1/3, 1, -3
ratios: 0, ∞, -2
since neither is constant, it is neither an A.P. or a G.P.
So, how to figure the next terms?
Note that the differences form a G.P., with the next terms 9,-27,81
Adding those to -2, we get 7,-20,61, or choice (A)
Tell whether the sequence 1/3,0,1,-2 is arithmetic, geometric, or neither. Find the next three terms of the sequence.
A.neither;7,-20,61
B.geometric;7,-20,61
C.arithmetic;1/3,1 1/3,3
D.geometric;-3 1/3, 5 5/9,9 7/27
1 answer
1 answer