book Maths Puzzle Numerical Ability

j(1,7)
k(3,-3)

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book Other Question

Determine which of the following can be the first three terms of an geometric sequence.
a. 3,-3,-3
b. -8,-16,-32
c. 26,30,34
d. 1/2,1/4,1/16
please help me solve this problem. Thank you. y=2x+5