Вторая прогрессия : 2 ; 19 ; 36 ; 53 , ...
a₁ = 2 a₂ = 19
a₂ = a₁ + d
d = a₂ - a₁ = 19 - 2 = 17
aₙ = a₁ + d(n - 1) = 2 + 17(n - 1) = 2 + 17n - 17 = 17n - 15
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Вторая прогрессия : 2 ; 19 ; 36 ; 53 , ...
a₁ = 2 a₂ = 19
a₂ = a₁ + d
d = a₂ - a₁ = 19 - 2 = 17
aₙ = a₁ + d(n - 1) = 2 + 17(n - 1) = 2 + 17n - 17 = 17n - 15