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How a Data Sufficiency question works

Welcome to Data Sufficiency

The method: one statement at a time

Value and yes/no questions

Value questions: exactly one value

Yes/no questions: a definite no is sufficient

Traps, and Data Sufficiency without numbers

The C and E traps

Data Sufficiency without numbers

Check yourself

Before you try the quizzes

Check: value, both alone

Check: a definite no

Check: the same fact twice

Check: two roots

Check: whole numbers

Check: without numbers

Answers and why

Foundations Unit 10 of The Prepspire GMAT Course: the five Data Sufficiency choices, value and yes/no questions, the C and E traps, and non-maths DS, with six explained quick checks.

Learn the five fixed choices, work one statement at a time, spot hidden second cases, and handle questions with no numbers at all.

Unit 10: Data Sufficiency

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