
 is true if both 

 and 

 are true.

 is true if both 

 and 

 are true.

 is true if either of the conjunctions are true. So either 

 and 

 are both true, or 

 and 

 are both true.
If you're looking at a truth table, then pick the rows where both 

 and 

 are true, or 

 and 

 are true, or all of 

 are true.