Which letter-cluster will replace the question mark (?) and complete the given series?
EFGH, FEHG, ?, HCJE, IBKD
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1, i.e., GDIF.
E + 1 = F, E + 1 = G, G + 1 = H, H + 1 = I
F - 1 = E, E - 1 = D, D - 1 = C, C - 1 = B
G + 1 = H, H + 1 = I, I + 1 = J, J + 1 = K
H - 1 = G, G - 1 = F , F - 1 = E, E - 1 = D