Question
The 5th term in a geometric sequence is 120. The 7th term is 30. What are the possible values of the 6th term of the sequence?
(1 point)
60
±60
75
±75
(1 point)
60
±60
75
±75
Answers
Answered by
oobleck
The geometric mean is ±√(30*120) = 60
or, since r^2 = 120/30 = 4,
r = ±2
so the middle term is ±60
or, since r^2 = 120/30 = 4,
r = ±2
so the middle term is ±60
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