Which term from among the given options can replace the question mark (?) in the following series to make it logically complete?
UC 169, WE 121, ?, AI 49, CK 25
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. YG 81.
Given series: UC 169, WE 121, ?, AI 49, CK 25
U + 2 = W; W + 2 = Y; Y + 2 = A; A + 2 = C
C + 2 = E; E + 2 = G; G + 2 = I; I + 2 = K
169 = 132; 121 = 112; 81 = 92; 49 = 72; 25 = 52