If `q` is false and `(p ^^ q) harr r` is also true then which of the following are tautology (A) `(pvvr) rarr (p^^r)` (B) `(pvvr)` (C) `(p^^r)rarr (pvvr)` (D) `p^^r`

If p, q are true and r is false statement then which of the following is true statement?

If p and q are true and r and s are false statements, then which of the following is true?

Find the truth values of the following compound statements : (a) (pvv~r) ^^(qvv~r) " " (b) ~ (pvv~q) ^^(~ pvvr)

If each of the statements p rarr ~ q ,~ r rarr q and p are true then which of the following is not true? (A) q is false (B) r is true (C) r rarr q is false (D) r^^ ~q is false

If the boolean expression ((p ^^ q) vv r) implies (p ^^ r) is false, then which of the following cannot represent ordered truth values of (p,q,r) ?