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Which of these two form a geometric sequence?

1. 2x, 4x - 2, 6x - 4 .....
2. x + 1, 2x + 2, 5x + 1 .....

1 answer

check the ratio of successive terms. If it's constant, you have a GP

(4x-2)/2x =?= (6x-4)/(4x-2)

(2x+2)/(x+1) =?= (5x+1)/(2x+2)

Looks like neither to me.

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