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(A) Key Idea: The negation of the universal quantifier $\forall$ (for all) is the existential quantifier $\exists$ (there exists),and the negation of

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$\exists n \in N$,such that $n+7 \leq 6$

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(A) Key Idea: The negation of the universal quantifier $\forall$ (for all) is the existential quantifier $\exists$ (there exists),and the negation of the inequality $>$ is $\leq$. Given the statement: $\forall n \in N, n+7 > 6$. Applying the rules of negation: $1$. Replace $\forall$ with $\exists$. $2$. Negate the condition $n+7 > 6$,which becomes $n+7 \leq 6$. Therefore,the negation of the given statement is $\exists n \in N$,such that $n+7 \leq 6$.

The negation of $\forall n \in N, n+7 > 6$ is ....

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