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Counting and probability

Arrangements, choosing a group, and the probability of two draws without replacement.

What you will practise

• Counting and probability. Arrangements, choosing a group, and the probability of two draws without replacement.

How the drill works

You get a set of ten questions at the level you choose, easy, medium or hard. Every set is generated fresh, so you can keep going without seeing the same question twice. After each answer you see the working. When you pick a wrong answer, the explanation names the slip that usually leads to it, so you can spot it next time. Drills are for practice only: Wittlo makes no claim about exam results.

More drills

Percent · Ratios · Interest · Work and rate · Speed and distance · Averages and mixtures · Number properties · Algebra · Quantity comparison · Data sufficiency · Number series