Answer: \(t_{19} = 115\)
a = 7, d = 13 – 7 = 6.
\(t_n = a + (n - 1)d\), so \(t_{19} = 7 + 18 \times 6 = 7 + 108 = 115\).
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Doubtly AI
· 24 Oct 2026
AI-verified · Oct 2026
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