Master Data Sufficiency from Zero

In Data Sufficiency, you are given a question followed by two statements (I and II). You must decide whether the data in the statements is sufficient to answer the question — WITHOUT actually solving the question. Answer choices are always: (A) Statement I alone is sufficient (B) Statement II alone is sufficient (C) Both statements together are sufficient (D) Either statement alone is sufficient (E) Neither statement is sufficient Key: You are testing SUFFICIENCY, not solving the problem!

Key Formulas

Sufficiency Test

A statement is sufficient if it gives ONE definite answer

If statement gives multiple possible answers, it is NOT sufficient.

Answer Choice Logic

Check I alone → Check II alone → Check I+II together

Always test in this order. Stop when you find sufficiency.

⚡ Shortcut Tricks

Never actually solve the problem — just check if it CAN be solved.

If a statement gives a unique answer, it is sufficient.

If a statement gives 2 or more possible answers, it is NOT sufficient.

For questions about value of x: statement is sufficient if you can find exactly one value of x.

For yes/no questions: statement is sufficient if it always gives YES or always gives NO (not sometimes yes, sometimes no).

TCS NQT often uses number/age/relation based data sufficiency questions.

✏️ Solved Examples

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