问题
单项选择题
If p and q are statements, which of the following formulas is tautological ( )
A.┐ (p→∧q
B.(p∨→p∧q
C.(q∧(p→)→p
D.((p→∧→q
答案
参考答案:D
If p and q are statements, which of the following formulas is tautological ( )
A.┐ (p→∧q
B.(p∨→p∧q
C.(q∧(p→)→p
D.((p→∧→q
参考答案:D