Answer:
n + 2
Explanation:
Let's see
1 -> 3 5 -> 7 7 -> 9
This can be seen as a function where
If a number n is input it increases by 2.
1 + 2 = 3
5 + 2 = 7
7 + 2 = 9
So mathematically, it is n + 2
Compare the input/ output values
1 → 3 , that is add 2 to input
5 → 7 , that is add 2 to input
7 → 9 , that is add 2 to input
Thus when the input is n , the output is n + 2
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