A series is given with one term missing. Select the correct alternative from the given ones that will complete the series. FR120, CO176, ZL232, WI288, ?
TF344
This is a mixed alphanumeric series: each term has three parts — a first letter, a second letter and a number — and each part follows its own independent rule, so the three are analysed separately and then recombined.
The terms are FR120, CO176, ZL232, WI288, and the first letters run F, C, Z, W: each step moves three places back in the alphabet cyclically (F→C→Z→W), so the next first letter is W→T = T.
The second letters run R, O, L, I: again each step moves three places back (R→O→L→I), so the next second letter is I→F = F.
The numbers run 120, 176, 232, 288: each step adds 56, since \(176-120=56\) and \(232-176=56\), so the next number is \(288 + 56 = 344\).
Combining the three separately-derived parts — first letter T, second letter F, number 344 — gives the missing term TF344.
The concept is to split a compound series into independent tracks, extend each by its own rule, and reassemble them for the answer.
Hence the correct answer is TF344.
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