200
In his preparation for his upcoming GRE test, David has been trying to memorize a long list of words organized in an alphabetical order. He seems to be doing fine with words that start with "a", "b", "c",... but he keeps getting trouble remembering words that begin with alphabetical letters that appear later in the list, such as "t" "y" & "z". This is because of...? (Two Words)
Proactive Interference