a We are asked to write an equation for the given sequence. It seems that it might be arithmetic, so we will check whether there is a common difference between the consecutive terms.
b We are asked to write an equation for the given sequence. It seems that it might be geometric, so we will check whether there is a common ratio between the consecutive terms.
The sequence is geometric with common ratio r=3. A geometric sequence in standard form is written in the following format.
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