Write the duals of each of the following.

1. Write the duals of each of the following. [video]

          (p∨q)∧r
          t∨(p∧q)
          (p∨q)∨r≡p∨(q∨r)
          p∧[~q∨(p∧q)∨~r]
          p∧(~q∨c)
          (p∧t)∨(c∧~q)

2. Write the dual statement of each of the following compound statements.

          Manjiri and Hitendra cannot read Urdu.
          Chetan has black hair and blue eyes.
          Mark is a  teacher or Erik is a doctor.
          Yuvraj or Nirmala are going to School.