For each pair of propositions A and B show whether or not A ≡ B.
1)A = a, B = ˅ b
2)A = b, B = ˅
3)A = b, B = ˅ b
4)˅ c), B = )
5)˅ c), B = ˅ c)
6)b, B =
7)b, B = a ↔ b
8) b) b c), B = c
9)A = b) c, B = b c)
10)A = ˅ c) b), B = b c)