Wzór na -ty wyraz ciągu arytmetycznego
aₙ = a₁ + (n - 1) * r
a₁₉ = a₅ + 14r
5 = 19 + 14r
14r = 5 - 19
14r = -14 /: 14
r = -1
a₁ = a₅ - 4r
a₁ = 19 - 4r = 19 - 4 * (-1) = 19 + 4 = 23
aₙ = 23 + (n - 1) * (-1)
aₙ = 23 - n + 1 = -n + 24
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Wzór na -ty wyraz ciągu arytmetycznego
aₙ = a₁ + (n - 1) * r
a₁₉ = a₅ + 14r
5 = 19 + 14r
14r = 5 - 19
14r = -14 /: 14
r = -1
a₁ = a₅ - 4r
a₁ = 19 - 4r = 19 - 4 * (-1) = 19 + 4 = 23
aₙ = 23 + (n - 1) * (-1)
aₙ = 23 - n + 1 = -n + 24