Bonsoir, Déterminer la valeur de vérité:

1) (∀ n ∈ N) : n(n+1)(n+2)(n+3)+1 est un carré parfait

2) (∃ x ∈ R) (∃ y ∈ R) ; 2x - y =3

3) (∀ x ∈ R) (∃ y ∈ R) ; x ≤ y

4) (∃ x ∈ R) (∀ y ∈ R) ; x ≤ y

svp et merciii​
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