The given sequence is 11, 31, 51, 72
The nth term of this sequence can be expressed as an = 11 + (n - 1) × 20
Therefore, the nth term is 11 + (n - 1) × 20, where n is the position of the term in the sequence.
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If you mean: 15 11 7 3 then the nth term is 19-4n
It is: nth term = 5-4n and so the next term will be -19
If you mean -1 3 7 11 15 then the nth term is 4n-5 and so the next term will be 19
The nth term is 7n-3 and so the next term will be 39
One of the infinitely many possible rules for the nth term of the sequence is t(n) = 4n - 1