Both are used to describe sequences.
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a maths solution
The nth term in the sequence -5, -7, -9, -11, -13 can be represented by the formula a_n = -2n - 3, where n is the position of the term in the sequence. In this case, the common difference between each term is -2, indicating a linear sequence. By substituting the position n into the formula, you can find the value of the nth term in the sequence.
The rule in this case is that there are no numbers in any position.
The Value of a term
once in a lower (subscript) position