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7,9,11,13,15
First, find the common difference (d)
9-7 = 11-9 = 13-11 = 15-13 = 2
d= 11
a1 = first term = 7
apply the formula:
an = a1 + (n-1) d
an = 7 + (n-1) 2
an = 7 + 2n-2
an = 2n + 5