Question

What is the recursive formula of 5, 10, 15, 20, 25, 30

Answer 1

Writing a recursive formula means to express the current element of the sequence, $a_n$, in terms of the previous elements:

$a_n = f(a_{n-1},\ a_{n-2},\ldots,\ a_2,\ a_1)$

In this case, the sequence is quite simple, since each term only depends on the previous one. In particular, each term is 5 more than its predecessor, so we have

$a_n=a_{n-1}+5$