Which letter cluster will replace the question mark (?) to complete the given series?
ABCD, BCDE, ?, DEFG, EFGH
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. CDEF.
ABCD, BCDE, ?, DEFG, EFGH
A + 1 = B, B + 1 = C, C + 1 = D, D + 1 = E
B + 1 = C, C + 1 = D, D + 1 = E, E + 1 = F
C + 1 = D, D +1 = E, E + 1 = F, F + 1 = G
D + 1 = E, E + 1 = F, F + 1 = G, G + 1 = H