Number series · solved example
Find the next term: 3, 7, 15, 31, ?
- 63Correct
- 62
- 64
- 59
Solution
Each term is double the previous plus one: 3×2+1=7, 7×2+1=15, 15×2+1=31, and 31×2+1=63.
Defence | ITBP Constable (GD & Tradesman)
ITBP Constable (GD & Tradesman) sets 25 General Intelligence & Reasoning questions for 25 marks in the Written Examination (CBT / OMR), so it is worth planning your preparation around the topics below.
The non-verbal and analytical reasoning that SSC and railway papers lean on: series, analogy, classification, coding and the figure-based questions. It rewards pattern recognition built through volume, so the return on drilling a lot of questions is unusually high here.
How much General Intelligence & Reasoning is worth in each ITBP Constable (GD & Tradesman) stage, from the official pattern.
| Stage | Questions | Marks | Time | Share |
|---|---|---|---|---|
| Written Examination (CBT / OMR) | 25 | 25 | — | 25% |
Every topic in the official syllabus. The linked ones open a set of solved questions you can practise straight away.
Written to the ITBP Constable (GD & Tradesman) pattern, with the answer key and the method behind it — a look at how the section is actually set before you drill the full topic sets.
Number series · solved example
Find the next term: 3, 7, 15, 31, ?
Solution
Each term is double the previous plus one: 3×2+1=7, 7×2+1=15, 15×2+1=31, and 31×2+1=63.
Analogy · solved example
Thermometer : Temperature :: Barometer : ?
Solution
A thermometer measures temperature; a barometer measures atmospheric pressure. The relationship is instrument to the quantity it measures.
Direction sense · solved example
A patrol walks 9 km north, then 12 km east. How far is the patrol from the starting point?
Solution
The path forms a right triangle with legs 9 km and 12 km. Distance from start = √(9²+12²) = √(81+144) = √225 = 15 km.
Coding-decoding · solved example
If 'POST' is coded as 'QPTU', how is 'BORDER' coded using the same pattern?
Solution
Each letter moves one place forward: B→C, O→P, R→S, D→E, E→F, R→S. So BORDER becomes CPSEFS.
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General Intelligence & Reasoning shows up in every ITBP Constable (GD & Tradesman) mock test, in the same interface, with sectional locking and negative marking.
ITBP Constable (GD & Tradesman): 16-question practice mock
16 questions | 20 min
ITBP Constable (GD & Tradesman) 2024 cycle (latest concluded) sets 25 General Intelligence & Reasoning questions for 25 marks in the Written Examination (CBT / OMR).
No. The ITBP Constable (GD & Tradesman) written stage carries no negative marking, so it is worth attempting every General Intelligence & Reasoning question you can.
The ITBP Constable (GD & Tradesman) syllabus lists Coding-decoding and number or letter series, Blood relations and directions, Analytical reasoning and puzzles, Classification and pattern recognition, Non-verbal and verbal reasoning at matriculation level. Weight your revision towards the ones you are weakest on and confirm the emphasis against the paper analysis for recent cycles.
Every General Intelligence & Reasoning question on this site is free and written to the exam pattern. Use the topic drills for instant-feedback practice, the daily quiz to keep the section warm, and the ITBP Constable (GD & Tradesman) mock tests to sit it under a real clock with negative marking.