Find the recursive formula for the arithmetic sequence 7, 5, 3, 1, −1 , . . .(1 point) Responses a1=7, an=an−1+2 a subscript 1 baseline equals 7 , a subscript n baseline equals a subscript n minus 1 baseline plus 2 a1=7, an=−2an−1 a subscript 1 baseline equals 7 , a subscript n baseline equals negative 2 a subscript n minus 1 baseline a1=7, an=an−1−2 a subscript 1 baseline equals 7 , a subscript n baseline equals a subscript n minus 1 baseline minus 2 a1=7, an=2an−1
The correct recursion formula for the arithmetic sequence 7, 5, 3, 1, −1, . . . is:
a1 = 7, an = an-1 - 2