Introduction
Critical Thinking in SSC CGL Tier-I Reasoning assesses your ability to evaluate arguments, identify assumptions, and draw logical conclusions. It tests analytical skills through statement-conclusion, cause-effect, and logical deduction questions. Mastery requires understanding logical structure and avoiding common fallacies.
Statement and Conclusion
In these questions, a statement (or set of statements) is given, followed by conclusions. You must determine which conclusions logically follow from the given information, without assuming extra facts. A conclusion follows if it is definitely true based on the statement, not merely possible.
Key Points
- Only use the information provided; do not bring in outside knowledge.
- A conclusion must be a direct logical consequence, not a guess or probability.
- If a conclusion is just one of many possibilities, it does not follow.
Solved Example 1
Question: Statement: All roses are flowers. Some flowers fade quickly. Conclusions: I. Some roses fade quickly. II. All flowers are roses.
Solution: Neither I nor II follows.
Explanation: From 'All roses are flowers' and 'Some flowers fade quickly', we cannot conclude that some roses fade quickly because the flowers that fade quickly may not be roses. Also, 'All flowers are roses' is not supported; it reverses the relationship.
Cause and Effect
Cause and effect questions present two statements and ask whether one is the cause of the other, both are effects of a common cause, or they are independent. The cause must logically precede the effect and be directly responsible for it.
Key Points
- The cause must occur before the effect in time.
- There should be a direct relationship; mere correlation is not causation.
- Consider if both events could be effects of a third, unstated factor.
Solved Example 1
Question: Statements: I. The government increased taxes on cigarettes. II. The sale of cigarettes decreased. Are they cause and effect?
Solution: Yes, I is the cause and II is the effect.
Explanation: Higher taxes typically increase the price, leading to reduced sales. The tax increase logically precedes and directly influences the decrease in sales.
Practice Questions
Q1. Statement: All cats are animals. Some animals are wild. Conclusions: I. Some cats are wild. II. All wild animals are cats. Which conclusion(s) follow?
Answer: Neither I nor II follows.
Explanation: The wild animals may not include cats. Also, 'All wild animals are cats' is not supported; it reverses the relationship.
Q2. Statements: I. The company launched a new product. II. The company's profits increased. Are they cause and effect?
Answer: Cannot be determined; they may be independent or have a common cause.
Explanation: Profit increase could be due to other factors like cost reduction or market trends. Without additional information, a direct causal link cannot be established.
Q3. Statement: If it rains, the match will be cancelled. It did not rain. Conclusion: The match was not cancelled. Does the conclusion follow?
Answer: No.
Explanation: The statement only specifies what happens if it rains. If it does not rain, the match could still be cancelled for other reasons. The conclusion is not logically guaranteed.
Common Mistakes
- Assuming extra information not given in the statement. Always stick strictly to the provided text.
- Confusing possibility with certainty. A conclusion must be definitely true, not just possible.
- Treating correlation as causation in cause-effect questions. Look for a direct causal link.
Quick Revision
- For statement-conclusion, only accept conclusions that are 100% guaranteed by the statement.
- In cause-effect, the cause must precede the effect and be directly responsible.
- Avoid using real-world knowledge unless it is universally accepted and implied by the statement.