🚧 Started chapter 2

chapter_2/test_yourself.md

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+**Test Yourself**
+
+Page 73
+
+1. An _and_ statement is true when, and only when, both components are _______.
+
+**Solution**
+
+True.
+
+2. An _or_ statement is false when, and only when, both components are _______.
+
+**Solution**
+
+False.
+
+3. Two statement forms are logically equivalent when, and only when, they always
+   have _______.
+
+**Solution**
+
+The same truth values.
+
+4. De Morgan's laws says (1) that the negation of an _and_ statement is
+   logically equivalent to the _______ statement in which each component is
+   _______, and (2) that the negation of an _or_ statement is logically
+   equivalent to the _______ statement in which each component is _______.
+
+**Solution**
+
+or; negated; and; negated.
+
+5. A tautology is a statement that is always _______.
+
+**Solution**
+
+true
+
+6. A contradiction is a statement that is always _______.
+
+**Solution**
+
+false