None of the following could.
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It is a sequence of numbers. That is all. The sequence could be arithmetic, geometric, harmonic, exponential or be defined by a rule that does not fit into any of these categories. It could even be random.
The sequence, -7, -21, 63 could be generated by Un = 49n2 - 161n + 105 so when n = 9 the term would be 2625.
It could be a trapezoid
All geometric figures.
A sequence of seven numbers is a set of numbers arranged in a specific order. Each number in the sequence is called a term. For example, a sequence of seven numbers could be {1, 3, 5, 7, 9, 11, 13}, where each term differs by a constant value of 2. Sequences can follow different patterns, such as arithmetic sequences where each term is found by adding a constant value to the previous term, or geometric sequences where each term is found by multiplying the previous term by a constant value.