Write the duals of the following statements :
(i) ` ( p vee q) vee r`
(ii) ` p ^^ q) ^^ r`
(iii) ` ( p vv q) ^^ (r vv s) `

Explanation

To find the duals of the given statements, we need to follow a specific rule: we convert every logical OR (denoted by ∨) into a logical AND (denoted by ∧) and every logical AND into a logical OR. Let's apply this rule step by step for each statement.

### Solution:

**(i)** For the statement \( (p \vee q) \vee r \):
- We identify the logical operators: there are two ORs (∨).
- To find the dual, we replace each OR with AND:
- The dual of \( (p \vee q) \vee r \) is \( (p \wedge q) \wedge r \).
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