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3 is the answer
There are infinitely many cubic functions that can be the rule for the above set of numbers. The simplest, though, is the linear rule: Un = 8n - 1 for n = 1, 2, 3, ...
7 * 3 - 7 + 24 / 3 - 5 = 1 This answer was calculated according to the order of operations. Rule 1: First perform any calculations inside parentheses. Rule 2: Next, from left to right, do all multiplications and divisions. Rule 3: Last, from left to right, do all additions and subtractions.
1254
The simplest is Un = 2n + 1