Question

Which of the following represents a geometric sequence?

A) 1/4, 1/4, 1/4, 1/4
B) 1/4, 1/5, 1/6, 1/7
C) 1/4, 1, -4, 16
D) 1/4, -4, 1/4, -4

Answer 1

A geometric sequence must have a constant ratio x/y

Now, technically a does, 1, however it's not really a sequence, depending how you define one.

So we need to find one that has a constant multiplier to it.
B definitely doesnt as that's just increasing the bottom of the fraction by 1 and to do that you have to multiply by a different number each time.

C however, does, it multiplies by -4 (dont forget that a negative x a negative is a positive), so this is the correct answer.

Answer 2

Couldnt A) Just be multiplied by 1/1 or is that cheating