SSC CGL 2025 Tier 1 Reasoning PYQ – 21 Sep 2025 Shift 3 (24 Questions with Solutions)

SSC CGL 2025 Tier 1 Reasoning PYQ 21 Sep Shift 3: Series, Coding and Puzzles

Pattern spotting in letter and number series, coding-decoding and logical deduction is the core skill this set builds. It contains the actual General Intelligence and Reasoning questions from SSC CGL 2025 Tier 1, 21 September 2025, Shift 3. On Aptitude360 each question comes with a worked solution.

Topics in this SSC CGL Reasoning shift

• Letter series and letter-cluster series built on alphabet position gaps
• Number series based on squares, cubes and factorials, including wrong-number detection
• Coding-decoding by letter shifts and reverse coding
• Blood relations, including symbol-coded family relations
• Syllogism and inequality-based conclusions
• Month-wise seminar arrangement puzzle
• Mathematical sign substitution, address matching, odd one out and word formation
• Statement and conclusion, and a train crossing a man

Key formulas and rules for this Reasoning set

• Train passing a man or a point: \( \text{Speed}=\dfrac{\text{Length of train}}{\text{Time}} \)
• Converting speed units: \( \text{Speed (km/h)}=\text{Speed (m/s)}\times\dfrac{18}{5} \)
• Square-plus-one series: \( T_{n}=n^{2}+1 \)
• Cube-minus-one series: \( T_{n}=n^{3}-1 \)
• Reverse alphabet position: \( \text{Reverse}=27-n \)
• Factorial series: \( n!=n\times(n-1)! \)

How to prepare for CGL Reasoning questions like these

• Memorise alphabet positions in both directions so letter shifts can be read instantly.
• For number series, test squares, cubes and factorials before trying differences.
• Draw a family tree with gender symbols for every blood relation question.

Who this set suits

SSC CGL aspirants who want sectional practice in General Intelligence and Reasoning using real 2025 Tier 1 questions.