Which letter-cluster will replace the question mark (?) to complete the given series?
ZFKQ, BCMN, ?, FWQH, HTSE
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. DZOK.
Z + 2 = B; B + 2 = D; D + 2 = F; F + 2 = H
F - 3 = C; C - 3 = Z; Z - 3 = W; W - 3 = T
K + 2 = M; M + 2 = O; O + 2 = Q; Q + 2 = S
Q - 3 = N; N - 3 = K; K - 3 = H; H - 3 = E