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Counting

Welcome to Unit 6

The multiplication principle

Permutations and combinations

Sets and probability

Overlapping sets and the two-set table

Probability: and, or, not

Without replacement

Statistics and sequences

Statistics: centre and spread

Sequences

Check yourself

Before you try the quizzes

Check: and or or

Check: does order matter?

Check: overlapping sets

Check: at least one

Check: spread

Check: term n

Answers and why

Advanced Unit 6 of the Prepspire GMAT Course: Counting, sets, probability and statistics.

Count arrangements and selections, untangle overlapping groups, find probabilities with and without replacement, and work with averages, spread and sequences.

Unit 6: Counting, sets, probability and statistics

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