conjunctions - Article after 'and' and 'or'

When talking about two objects using and and or, when should I use a and an? Take the following sentences as an example. When is the article appropriate?

1. 
   

   I have an orange and apple in my hand.
   
   I have an orange and an apple in my hand.

   
   


2. 
   

   I have a television and radio at my home.
   I have a television and a radio at my home.

   
   


3. 
   

   I would love to have an orange or an apple in breakfast.
   I would love to have an orange or apple in breakfast.

   
   



4. 
   

   I had some money three months ago, I could buy a television or a radio.
   I had some money three months ago, I could buy a television or radio.

   
   


5. 
   

   I have a mango and an apple in my hand.
   I have an apple and mango in my hand.