[" 19.None of these "],[" For any three simple statement p,q,r the "],[" statement (p wedgeq) "vv(q^^r)" is true when- "],[[" (1) "n" end "," ( ",q])vv]

for any three propositions p,q and r, the proposition ( p ^^ q) ^^ ( q ^^ r) is true when

For any three simple statement p,q,r the statement (p ^^ q) vv (q ^^ r) is true when- (a) p and r true and p is false (b) p and r false and q is true (c) p,q,r all are false (d) q and r true p is false

The dual of the statement ~( p vv q) ^^ [p vv(q ^^ ~r)] is

The dual of the statement ~( p vv q) ^^ [p vv(q ^^ ~r)] is

Negation of the statement ~ p to (q vv r) is

Negation of the statement ~ p to (q vv r) is

Negation of the statement ~p to (q vv r) is

The dual of the statement (p vv q) ^^ ~(r vv s) is