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English and Logical Reasoning Prep Guide
Exam
English and Logical Reasoning Prep Guide
Subject
Logical Reasoning
Chapter
Series Completion

English and Logical Reasoning Prep Guide · Logical Reasoning · Series Completion

In the following series, a wrong term is given. Find the wrong...

In the following series, a wrong term is given. Find the wrong term. A7, C7, F21, M42, U168

Options

  1. AC 7
  2. BF21
  3. CM42
  4. DU168

Correct answer

B. F21

Step-by-step solution

AlphabetsABCDEFGHIJKLM
Positional value12345678910111213
Positional value26252423222120191817161514
AlphabetsZYXWVUTSRQPON
The pattern followed here is, A→+2C→+4C→+6M→+8C7→×17→×214→×342→×4168\begin{aligned} & \mathrm{A} \xrightarrow{+2} \mathrm{C} \xrightarrow{+4} \mathrm{C} \xrightarrow{+6} \mathrm{M} \xrightarrow{+8} \mathrm{C} \\ & 7 \xrightarrow{\times 1} 7 \xrightarrow{\times 2} 14 \xrightarrow{\times 3} 42 \xrightarrow{\times 4} 168\end{aligned} Hence, the wrong term in the given series is F21.
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