Which of the followings are tautology ?
A. (p ∨ r) → p
B. p → (p ∧ r)
C. ∼ p →(p → r)
D. (p ∧ r) → (p → r)
E. ∼(p → r) → p
Choose the correct answer from the options given below :
1
A, B Only
2
A, B, C Only
3
B, C, D Only
4
C, D, E Only
Which of the followings are tautology ?
A. (p ∨ r) → p
B. p → (p ∧ r)
C. ∼ p →(p → r)
D. (p ∧ r) → (p → r)
E. ∼(p → r) → p
Choose the correct answer from the options given below :