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RRB NTPC General Intelligence and Reasoning — practice by topic

Browse 381 questions across 17 General Intelligence and Reasoning topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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General Intelligence and Reasoning topics

Analogies (57)Decision Making (44)Coding Decoding (38)Logical Reasoning (30)Cardinal Direction (29)Blood Relations (25)Odd One Out (25)Statement and Conclusion (24)Venn Diagrams (24)Anagram (22)Number Series (15)Syllogism (14)Floor Puzzle (13)Interpretation of Graphs (11)Data Sufficiency (6)Order of Operations (2)Statement and Courses of Action (2)

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Find the next number: 2, 6, 12, 20, 30, ?Read the answer and worked solution →Find the next number: 1, 4, 9, 16, 25, ?Read the answer and worked solution →Find the next: 3, 7, 15, 31, 63, ?Read the answer and worked solution →Find the next: 1, 1, 2, 3, 5, 8, ?Read the answer and worked solution →

Worked practice questions

Find the next number: 2, 6, 12, 20, 30, ?

  1. 40
  2. 36
  3. 42
  4. 44
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Correct answer: C. 42

**Differences:** 4, 6, 8, 10 (increasing by 2). Next difference = 12. So 30 + 12 = 42. Equivalent: n(n+1) for n=1,2,3,... giving 2, 6, 12, 20, 30, 42.

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Find the next number: 1, 4, 9, 16, 25, ?

  1. 49
  2. 36
  3. 32
  4. 30
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Correct answer: B. 36

Series of perfect squares: 1², 2², 3², 4², 5². Next = 6² = 36.

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Find the next: 3, 7, 15, 31, 63, ?

  1. 125
  2. 99
  3. 127
  4. 95
Show answer and solution

Correct answer: C. 127

Each term is 2 × previous + 1: 3 → 7 (2×3+1), 7 → 15 (2×7+1), 15 → 31, 31 → 63, 63 → 127. Or 2ⁿ⁺¹ - 1.

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