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Arithmetic sequences
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Learn it An arithmetic sequence adds the same number d each time. Term n is $t_n = a + (n - 1)d$, where a is the first term.
Example: Find term 20 of 7, 11, 15, …
- a = 7, d = 4.
- $t_{20} = 7 + 19 \times 4$.
- $= 7 + 76 = $ 83.
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