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Which of the following is NOT a geometric sequence?

a. 20,−40,80,−160,320,...
b. 5,2.5,1.25,0.625,0.3125,...
c. 1,2,4,8,16,...
d. 100,50,10,5,1,...

1 Answer

1 vote

Answer:

The sequence 100, 50, 10, 5, 1, ... is NOT a geometric sequence because there is no single constant ratio that multiplies each term to get the next one.

User Peter Csala
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