three varibale quantifier closed

Question

P(X,Y,Z):-   X+Y+Z=10

state true false and the reason behind;

1 $\forall X\forall Y\forall Z $P(X,Y,Z)

2  $\forall X \forall Y  \exists Z $P(X,Y,Z)

3  $\forall X \exists Z \forall Y$P(X,Y,Z)

4  $\exists Z \forall X \forall Y $P(X,Y,Z)

5  $\exists Z \exists Y\forall X$P(X,Y,Z)

6  $\exists X \exists Y \exists Z $P(X,Y,Z)

7  $\forall X \exists Y \exists Z$P(X,Y,Z)

a bit confused..