aₙ = 2n - 3
a₁ = 2 * 1 - 3 = - 1
a₂ = 2 * 2 - 3 = 1
a₂ = a₁ + d
d = a₂ - a₁ = 1 - (- 1) = 1 + 1 = 2
Ответ : d = 2
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Verified answer
aₙ = 2n - 3
a₁ = 2 * 1 - 3 = - 1
a₂ = 2 * 2 - 3 = 1
a₂ = a₁ + d
d = a₂ - a₁ = 1 - (- 1) = 1 + 1 = 2
Ответ : d = 2