se a tree diagram for the following. - Find the number of ways 2 letters can be choosen from the set {U, V, W} if order is important and repetition is lowed. - Reconsider part a if no repeats are allowed. - Find the number of combinations of 3 elements taken 2 at a time. Does this answer differ from part a or b? .The number of ways to select 2 letters from the set {U, V, W} if order is important and repetition is allowed is . The number of ways to select 2 letters from the set {U, V, W} if no repeats are allowed is