Showing all working, find a formula for the general term of the sequence (sn) = s3, s4, s5 . . . defined by
s3 = π and sn = sn-1 - 2 for n >= 4.
An arithmetic progression is a sequence of the form
where the initial term and the common difference are real numbers.
We have
Hence we have the arithmetic progression
The general term of the sequence is
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