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OpenStudy (anonymous):
The fifth and the seventh terms of a geometric sequence are 3 and 9. What are all POSSIBLE values of the sixth term of the sequence?
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OpenStudy (anonymous):
a_5 = ar^4 = 3 a_6 = ar^5 = 3r a_7 = ar^6 = 3r^2 = 9 -> r = plus minus sqrt(3) and a_6 = plus minus 3 sqrt 3
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