20-9x=n
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The nth term is equal to 4n.
tn = 34 - 9n where n = 1,2,3,...
Un = 29 - 9n
The Nth term in the series is [ 2N ] .
Clearly, if you omit the sign, the nth. term will be 4n. The alternating sign can easily be expressed as a power of (-1), so in summary, the nth. term is (-1)n4n.