The adding numbers keep going up, and the subtracting numbers keep going down: # Plus 4 # Subtract 3 # Plus 5 # Subtract 2 # Plus 6 # Subtract 1
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Because 3 * 2 = 6, 6 * 2 = 12, and 12 * 2 = 24, the common ration of the sequence is 2. If we are given the fact that the sequence does have a common ratio, the answer can be found by simply taking 6/3 = 2.
3 1.5
No it is not.U(2) - U(1) = 6 - 2 = 4U(3) - U(2) = 18 - 6 = 12Since 4 is different from 12, it is not an arithmetic sequence.
No, geometric, common ratio 2
12