This page covers IBPS PO Data Sufficiency — Reasoning with complete concept notes, 1 graded practice MCQs, key points and exam-specific tips. Free to study.
Data Sufficiency is a unique question type where you don't solve the problem completely. Instead, you determine whether the given information is enough to answer the question. Think of it as being a detective - you need to check if the clues are sufficient to solve the case.
In SSC CGL, data sufficiency questions typically provide a question followed by two statements (I and II).
Your job is to decide which combination of statements can answer the question. The standard answer choices are:
A) Statement I alone is sufficient
B) Statement II alone is sufficient
C) Both statements together are sufficient
D) Neither statement is sufficient
E) Each statement alone is sufficient
Key Rules: Never assume information not given. Don't make calculations unless necessary - just check if calculation is possible.
Focus on 'Can I solve?' not 'What is the answer?'. Remember that 'sufficient' means you can find a unique answer, not multiple possibilities.
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Exam Patterns
What examiners ask — read before attempting PYQs
SSC CGL asks 2-3 data sufficiency questions per paper. Common topics include ages, profit-loss, time-work, geometry, and number problems. Questions often test logical thinking more than mathematical computation.
Powerful Shortcut: Use the SCAN method - S(can I solve with Statement I alone?), C(an I solve with Statement II alone?), A(re both needed together?), N(ot sufficient even together?). This systematic approach prevents confusion and saves time.
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Worked Example
Solve this step-by-step before moving on
1
Step 1
Check Statement I alone
Statement I gives us: Ram = Shyam + 5
This has two unknowns but only one equation. We cannot find Ram's exact age.
Statement I alone: NOT SUFFICIENT
2
Step 2
Check Statement II alone
Statement II gives us: Ram + 10 = 2 × (Shyam's current age)
Again, two unknowns, one equation. Cannot find exact ages.
Statement II alone: NOT SUFFICIENT
3
Step 3
Check both statements together
From I: Ram = Shyam + 5, so Shyam = Ram - 5
From II: Ram + 10 = 2 × Shyam
Substituting: Ram + 10 = 2(Ram - 5)
Ram + 10 = 2Ram - 10
20 = Ram
Both statements together give us Ram's age as 20 years.
Answer: C) Both statements together are sufficient
Common Mistake: Students often try to solve the complete problem instead of just checking sufficiency. This wastes time and can lead to wrong conclusions. Another trap is assuming obvious information that isn't stated - stick strictly to what's given.
Remember: In data sufficiency, your goal is to be a judge, not a calculator. Judge whether the evidence is enough to reach a verdict.
Test Data Sufficiency — Reasoning under exam conditions
Question: In a row of students facing North, what is Priya's position from the left end?
Statement I: Priya is 8th from the right end of the row.
Statement II: There are 15 students in the row.
Which of the statements is/are sufficient to answer the question?
60-Second Revision — Data Sufficiency — Reasoning
Remember: Judge sufficiency, don't calculate the actual answer unless necessary
Formula: Use SCAN method to systematically check each statement combination
Trap: Never assume information not explicitly stated in the problem
Strategy: If one statement alone works, don't waste time checking combinations
Focus: Look for unique answer possibility, not multiple solutions
Time tip: Spend maximum 2 minutes per question using elimination method