Which of the following letter-clusters will replace the question mark (?) in the given series?
PTPA, OSOB, NRNC, ?, LPLE
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. MQMD.
Given series: PTPA, OSOB, NRNC, ?, LPLE
P - 1 = O; O - 1 = N; N - 1 = M; M - 1 = L
T - 1 = S; S - 1 = R; R - 1 = Q; Q - 1 = P
P - 1 = O; O - 1 = N; N - 1 = M; M - 1 = L
A + 1 = B; B + 1 = C; C + 1 = D; D + 1 = E