Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
CDE, FAH, IXK, ?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. LUN.
Given series: CDE, FAH, IXK, ?
C + 3 = F, F + 3 = I, I + 3 = L
D - 3 = A, A - 3 = X, X - 3 = U
E + 3 = H, H + 3 = K, K + 3 = N