Question 1
Consider the statement: 'Neither John nor Mary came'
If p is F and q is F, what is the truth value of 'Neither John nor Mary came'?
Step 1: Understand 'neither...nor' statements
'Neither p nor q' means 'not p AND not q'
Logical form: ¬p ∧ ¬q
Step 2: Build the truth table
¬p ∧ ¬q is True ONLY when both p and q are False
Truth table:
p=T, q=T → ¬T ∧ ¬T = F ∧ F = F
p=T, q=F → ¬T ∧ ¬F = F ∧ T = F
p=F, q=T → ¬F ∧ ¬T = T ∧ F = F
p=F, q=F → ¬F ∧ ¬F = T ∧ T = T
Step 3: Apply given values
p = F, q = F
¬p = T, ¬q = T
¬p ∧ ¬q = T
Answer: True
'Neither p nor q' means 'not p AND not q'
Logical form: ¬p ∧ ¬q
Step 2: Build the truth table
¬p ∧ ¬q is True ONLY when both p and q are False
Truth table:
p=T, q=T → ¬T ∧ ¬T = F ∧ F = F
p=T, q=F → ¬T ∧ ¬F = F ∧ T = F
p=F, q=T → ¬F ∧ ¬T = T ∧ F = F
p=F, q=F → ¬F ∧ ¬F = T ∧ T = T
Step 3: Apply given values
p = F, q = F
¬p = T, ¬q = T
¬p ∧ ¬q = T
Answer: True