SSC CGL 2025 Tier 1 Reasoning PYQ – 16 Sep 2025 Shift 1 (24 Questions with Solutions)

SSC CGL 2025 Tier 1 Reasoning PYQ 16 Sep Shift 1: Coding, Series and Logic

This set builds the coding, series and logical deduction skills tested in SSC CGL General Intelligence and Reasoning. It contains the actual Reasoning questions from the SSC CGL 2025 Tier 1 exam of 16 September 2025, Shift 1. Aptitude360 includes a worked solution for each question.

Question types in this CGL Reasoning set

• Alphabet mirror coding and letter-to-digit code languages
• Letter-cluster series, alphanumeric series and missing-letter patterns
• Number series and number-operation puzzles with hidden rules
• Symbol and operator substitution in expressions
• Blood relations, including photograph-pointing statements
• Syllogism, statement and conclusion, and statement and assumption
• Address matching, odd one out and word formation from given letters

Key rules for SSC CGL coding and series questions

• Mirror letter positions: \( p+p'=27 \)
• Series that doubles and adds one: \( a_{n+1}=2a_{n}+1 \)
• Average of consecutive odd numbers: \( \text{Avg}=\dfrac{\text{first}+\text{last}}{2} \)
• Splitting a sum in ratio a to b: \( \dfrac{a}{a+b}\times S \)

Revision tips for General Intelligence and Reasoning

• Memorise the forward and reverse positions of letters so coding steps go quickly
• In operator substitution, rewrite the expression first and then apply BODMAS
• Draw a family tree with gender symbols for every blood relation question
• Use Venn diagrams to test each syllogism conclusion

Who should practise this set

SSC CGL aspirants who know the basic reasoning question types and want to practise them on real Tier 1 questions.