alleryStart learning →5 : 24 :: 8 : ?
- 81
- 63
- 48
- 56
Show answer and solution
Correct answer: B. 63
Pattern: n² - 1. 5² - 1 = 24. 8² - 1 = 63.
RRB Group D Classification — practice questions
Explore 23 free Classification questions in RRB Group D Reasoning. Open each question or exercise to read its content, reference answers and available explanation.
Practise Classification with Quill →Classification questions and exercises with answers
Showing questions 1–23 of 23.
5 : 24 :: 8 : ?Read the answer and worked solution →Identify the odd one out: S18, U20, Y25, W22Read the answer and worked solution →Choose the person who does NOT belong to the group.Read the answer and worked solution →Match each proposition form to its letterRead the answer and worked solution →Universal or particular? Affirmative or negative?Read the answer and worked solution →Affirmative or negative?Read the answer and worked solution →Naming the formRead the answer and worked solution →True or false: what conversion allowsRead the answer and worked solution →Tap every inference that is actually validRead the answer and worked solution →Complete the four formsRead the answer and worked solution →True or false: what a universal claim coversRead the answer and worked solution →Deduction or induction?Read the answer and worked solution →Order the steps: test a syllogismRead the answer and worked solution →True or false: reasoning from two premisesRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Flip and pair: letter with statementRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Deduction against inductionRead the answer and worked solution →Tap every statement that follows from 'All cats are animals'Read the answer and worked solution →Complete the conversion ruleRead the answer and worked solution →Which reversal is safe?Read the answer and worked solution →
Worked practice questions
Identify the odd one out: S18, U20, Y25, W22
- S18
- Y25
- U20
- W22
Show answer and solution
Correct answer: B. Y25
1. Check letter position vs number: S=19, U=21, Y=25, W=23, and each number is position − 1.
2. S18 (19-1), U20 (21-1), W22 (23-1) all fit, but Y25 should be 24, not 25.
3. Hence Y25 is the odd one out.
_Source: RRB Group D CEN-02/2018 PYQ, Q.44._
Choose the person who does NOT belong to the group.
- Virat Kohli
- Alexander Graham Bell
- Albert Einstein
- Thomas A. Edison
Show answer and solution
Correct answer: A. Virat Kohli
1. Bell, Einstein and Edison are renowned scientists and inventors.
2. Virat Kohli is a cricketer, not a scientist.
3. So Virat Kohli does not belong to the group.
_Source: RRB Group D CEN-02/2018 PYQ, Q.87._
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