These are the first six terms of a sequence with a = 2:
2, 18, 162, 1458, 13122, 118098,
find a recursive formula for this sequence that is valid for n > 1.
write your answer in simplest form.

= 9

Step-by-step explanation:

Note there is a common ratio r between consecutive terms of the sequence, that is

r = 18 ÷ 2 = 162 ÷ 18 = 1458 ÷ 162 = 13122 ÷ 1458 = 9

A recursive formula allows a term in the sequence to be found by multiplying the previous term by the common ratio, that is

= 9 with a₁ = 2

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