Select the letter-cluster that can replace the question mark (?) in the following series.
TOC, SLX, RIS, QFN,?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. PCI.
Given series: TOC, SLX, RIS, QFN,?
T - 1 = S, S - 1 = R; R - 1 = Q, Q - 1 = P
O - 3 = L, L - 3 = I; I - 3 = F, F - 3 = C
C - 5 = X, X - 5 = S; S - 5 = N, N - 5 = I