7.5 Critical Reasoning Passages (Strengthen/Weaken & Paradox Resolution)

Critical Reasoning Passages (Strengthen/Weaken & Paradox Resolution)

In the SBI PO Main Examination, Critical Reasoning transitions from single-statement items to short analytical passages (100–200 words). These passage-based questions are modeled on graduate-level management and aptitude tests, assessing deep logical reasoning, argument deconstruction, and evidence evaluation under strict time pressure.

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1. Deconstructing an Argument

Before answering any question type, you must dissect the passage into its structural components:

[ PREMISES (Given Facts / Data) ] + [ UNSTATED ASSUMPTION ] ---> [ CONCLUSION (Author's Claim) ]

1. Premise: Fact, statistic, or evidence explicitly stated by the author (accepted as 100% true).
2. Conclusion: The core claim, opinion, or recommendation derived by the author.
3. Assumption: The unmentioned logical bridge connecting the premise to the conclusion.

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2. Question Types & Strategic Methodologies

Question Type 1: Strengthening the Argument

• Objective: Find an answer choice that makes the author's conclusion more likely to be true.
• How to Strengthen:
  1. Confirm or validate the unstated assumption.
  2. Eliminate an alternative cause for the observed outcome.
  3. Provide additional supporting data or a parallel working example.

Question Type 2: Weakening the Argument

• Objective: Find an answer choice that makes the author's conclusion less likely to be true or exposes a flaw.
• How to Weaken:
  1. Attack the assumption connecting premise to conclusion.
  2. Introduce a strong alternative explanation for the premise data.
  3. Show a counter-example where the premise exists but the conclusion fails.

Question Type 3: Resolving a Paradox / Discrepancy

• Objective: Explain how two seemingly contradictory facts mentioned in the passage can both be true at the same time.
• Methodology: Do NOT deny either fact. Find an option that introduces a new, unstated factor bridging Fact A and Fact B.

$\text{Fact A (High X)} + \text{Fact B (Low Y)} + \mathbf{Resolving\ Factor\ Z} = \text{Logical Harmony}$

Question Type 4: Drawing Inferences / Must Be True

• Objective: Select a statement that is 100% mathematically or logically proven strictly by the text.
• Rule: If an option requires even 1% outside assumption, eliminate it.

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3. Comparison Matrix of Advanced CR Question Types

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4. Step-by-Step Worked Example (SBI PO Mains Style)

Passage:

"Over the past three years, Bank Alpha launched an aggressive cashback campaign offering 5% rewards on all credit card purchases made at grocery supermarkets. During this period, total credit card spending at supermarkets increased by 60%. Bank executives concluded that the 5% cashback campaign was the direct cause of the increased card spending by its customers."

Question 1 (Weaken): Which of the following, if true, most seriously weakens the executives' conclusion?

• Option A: Competitor banks offered 2% cashback during the same period.
• Option B: During the same three-year period, overall inflation caused grocery prices across all supermarkets to rise by 65%, while cash payments were phased out by major supermarket chains.
• Option C: Bank Alpha's customer service satisfaction rating improved by 5%.
• Option D: Credit card spending in non-grocery categories also rose by 1%.

Detailed Analysis:

• Deconstruct Argument:
  • Premise: Card spending at supermarkets rose 60% after 5% cashback introduced.
  • Conclusion: Cashback campaign caused the spending increase.
  • Assumption: No other external factor caused the 60% spending increase.
• Evaluate Option B: Option B introduces two massive alternative explanations: grocery prices rose by 65% (so spending would rise 65% in nominal terms even if buying volume stayed constant) AND supermarkets stopped accepting cash. This completely destroys the conclusion that cashback drove the spending growth. (Option B weakens the argument).

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Question 2 (Resolve Paradox):

Passage:

"In City K, the municipal corporation implemented strict automated traffic cameras that issued fines for speeding. In the first year, the total number of speeding tickets issued tripled. However, during the exact same year, the total revenue collected from traffic fines by the municipal treasury dropped by 40%."

Which option resolves the discrepancy?

• Option A: Speeding cameras were installed only on major highways.
• Option B: Fines for non-speeding violations (like illegal parking) were reduced to zero, and speeding fines were converted to community service hours instead of monetary penalties.
• Option C: City K's population increased by 10% during the year.
• Option D: Traffic camera maintenance costs were higher than expected.

Detailed Analysis:

• Fact A: Speeding tickets issued tripled (3x tickets).
• Fact B: Fine revenue collected fell by 40%.
• Evaluate Option B: If speeding fines were converted to community service hours (no money collected) and other monetary fines were zeroed out, then tripling ticket volume yields ZERO cash revenue. This perfectly reconciles Fact A and Fact B. (Option B resolves the paradox).