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The third term of a geometric sequence is -10, and the fourth term is -5. Find the first term and the fifth term.
a. a1 = 80 and a5 = 2
b. a1 = -40 and a5 = 5/2
c. a1 = 40 and a5 = 5/2
d. a1 = -40 and a5 = -5/2
Find the common ratio of the given geometric sequence: -1, 3, -9, 18, ...
a. -1/3
b. -3
c. 1/3
d. 3
The third term of a geometric sequence is -10, and the fourth term is -5. Find the common ratio.
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