Data Sufficiency in Reasoning

What you will be able to do

• Apply the five standard sufficiency options without solving the whole question.
• Evaluate statement I alone, then statement II alone, before ever combining them.
• Judge 'sufficient' as 'the answer is uniquely determined', not 'I found an answer'.
• Avoid the traps: assumed positive integers, assumed directions, and combining too early.

What is inside this lesson

1. 1The format and the five options
2. 2Alone first, then together
3. 3'Sufficient' means uniquely determined
4. 4The usual traps
5. 5Worked examples through all five options
6. 6Quick revision
7. 7Practice