Question

Find the recursive formula for the arithmetic sequence 7, 5, 3, 1, −1
−
1
, . . .(1 point)
Responses

a1=7
𝑎
1
=
7
, an=an−1+2
𝑎
𝑛
=
𝑎
𝑛
−
1
+
2
a subscript 1 baseline equals 7 , a subscript n baseline equals a subscript n minus 1 baseline plus 2

a1=7
𝑎
1
=
7
, an=2an−1

Answer 1

The common difference is −2, so the recursive formula is
a1 = 7, an = a_{n−1} − 2 for n ≥ 2.