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In order to determine whether or not this is an arithmetic sequence, there must be at least 3 numbers.
The next is 3.
Each number is got by adding an amount two larger than the last amount added. 9 (+3) 12 (+5) 17 (+7) 24.Continuing this we get 33, 44 and 57.
Any arithmetic operation, other than division by zero, can be performed on any set of numbers in a sequence.
A(1) = 12A(4) = 3 A(10) = -15.