If y = θⁿ, where n ∈ ℤ⁺, which of the following is not correct?

Lagos State University MAT102 2014 past question

1. θ²y″ - n²y′ + ny = 0
2. θy′ = ny
3. θ²y″ = n(n-1)y
4. y + y′ = nθⁿ(n⁻¹ + θ⁻¹)

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