Question

A1=16 and a3=4

what is the common ratio
what is the explicit rule? (example: a1(r)^n-1, obviously you will be replacing the a1 and r for the number)

Answer 1

Explanation:

A geometric sequence is generated by multiplying the first term in the sequence, , several times by a fixed scalar . and so on, down to ..Using the result above, the sequences you're interested in are

31)

33)

We can rewrite these results to make them slightly cleaner.