Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
OLK, MNL, KPM, IRN, ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2, i.e., GTO.
O - 2 = M, M - 2 = K, K - 2 = I, I -2 = G
L + 2 = N, N + 2 =P, P + 2 = R, R + 2 = T
K + 1 = L, L + 1 = M, M + 1 = N, N + 1 = O