Known finite sequence 5,7,9 , 2n + 7 (n is an even number), then 9 + n is the item of the sequence The answer is n / 2 + 3,

an=3+2n
To avoid confusion, an = 3 + 2n is transformed into m, that is, am = 3 + 2m = 9 + n
The solution is that M is the number of terms n / 2 + 3

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