Question 149402
how do you figure out the nth term of :
21,19,17,15...
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Line the numbers up with 1,2,3,4...
1----21
2----21-1*2
3----21-2*2
4----21-3*2
...
n....21-(n-1)2 = 21-(2n-2)=21-2n+2 = 23-2n
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The nth term is a(n) = 23-2n
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Cheers,
Stan H.