Data sufficiency — Practice MCQs

In data sufficiency you don't have to find the answer. You only decide whether the statements give enough information to fix one answer.

Options used here

1. Statement I alone is sufficient (II alone is not).
2. Statement II alone is sufficient (I alone is not).
3. Both statements together are needed.
4. Even both together are not sufficient.

Method

1. Test statement I on its own: does it leave exactly one answer?
2. Test statement II on its own.
3. Only if neither works alone, combine them.

Watch out for statements that sound useful but only narrow the answer down (for example "the number is even") without fixing it.