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To find the nth number of an arithmetic sequence, you use this formula:
For example if the sequence is 5, 7, 9, 11... and we want to find the 16th term, then a1= 5, d=+2, and n=16. It is solved like this:
For example if the sequence is 5, 7, 9, 11... and we want to find the 16th term, then a1= 5, d=+2, and n=16. It is solved like this:
So the 16th term is 35.