Find the first term and the common ratio of the geometric sequence.75, 30, 12, 4.8, 1.92, . . .
A. a1 = 0.4, r = 2.5
B. a1 = 0.4, r = -0.4
C. a1 = 75, r = 1.92
D. a1 = 75, r = 0.4
Answer: D
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eter dash 
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+ 
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+ 
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