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English and Logical Reasoning Prep Guide
Exam
English and Logical Reasoning Prep Guide
Subject
Logical Reasoning
Chapter
Classification

English and Logical Reasoning Prep Guide · Logical Reasoning · Classification

Four of the following are similar in some respect. Find the odd one?

Four of the following are similar in some respect. Find the odd one?

Options

  1. A143
  2. B63
  3. C195
  4. D257

Correct answer

D. 257

Step-by-step solution

The given numbers can be written as follows: 143=122−1;63=82−1;195=142−1;15=42−1143=12^2-1 ; 63=8^2-1 ; 195=14^2-1 ; 15=4^2-1 But 257=162+1257=16^2+1 Obviously, except 257 others can be written in the form x2−1x^2-1.
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