1 Answer

Yifanwu · Answer 1 · 2017-01-29T12:08:04+0000

19, 13, 7, 1,…
- 6 - 6 - 6

Something that is explicit to the problem is tat it has a common difference of -6.

a(n) = a₁ + d(n - 1)
a(n) = 19 - 6(n - 1)
a(n) = 19 - 6(n) + 6(1)
a(n) = -6n + 19 + 6
a(n) = -6n + 25

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