Mathematical logic-Past ( previous ) years question for entrance exam.

 .De Morgan's law 

  (a) ~(p∨q)=~p∧~q

  (b) ~(p∧q)=~p∨~q

* Past (previous) years questions in entrance exam:

(1)~(p∧q) is logically equivalent to                                                  (Mht cet 2007)

a)p∨q

b)p∧q

c)~p∨~q

d)~p∧~q