A= The set of all even natural numbers less than 20. Present this in Roaster form.

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
A = {, 4, , 8, , 12, , 16, }