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Given the sequence $−15;−11;−7;…173$. Is this an arithmetic sequence? What is the formula of the general term?
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Given the sequence −15;−11;−7;…173−15;−11;−7;…173.

d = -11-(-15) = 4

a = -15

Tn = a + (n-1)d

= -15 + (n-1)4

= -15 + 4n -4

= 4n - 19
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