As an expression if nth term 12 10 8 6 4
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The common difference is -2, so the formula for the nth term is 12-2(n-1). This can be written 12-2n+2=14-2n, so that when n=1, the 1st term is 14-2=12. The 5th term is 14-10=4; the 6th is 14-12=2
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