The common ratio of the sequence is 5
Common ratio is the ratio between the preceding and the succeeding term of a sequence
Given the sequence 3, 15, 75 ...
T1 = 3
T2 = 15
T3 = 75
common ratio r = T3/T2 = T2/T1
r = 75/15 = 15/3 = 5
Hence the common ratio of the sequence is 5
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