Hard
Find the missing term in the letter series: XYZ, CBA, UVW, FED, ?
Explanation
Explanation
The 1st, 3rd and 5th groups (XYZ, UVW, ?) are ascending triplets whose starting letters go backward through the alphabet by 3 each time: X, U, then R. So the next group is RST. (The 2nd and 4th groups, CBA and FED, are a separate descending pattern moving forward by 3.)
PRO TIP
Re-check your working by substituting the answer back into the original question.