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Unit 10: count by structure

Count by multiplying

Read this before the quizzes

And means multiply, or means add

Arrange or choose?

Identical letters and repeats

The multiplication principle

Order matters

A group, not roles

Answers and why: count by multiplying

Restrictions, tables and sharing

Glue it, or take it off

Round a table

Sharing things out

Together

Not together

Answers and why: restrictions, tables and sharing

Probability

Favourable over all

And, without replacement

At least one: one minus none

Given that: a smaller world

At least one

Without replacement

Answers and why: probability

Sets and Venn diagrams

Two sets and 'neither'

Three sets

Smallest and largest overlaps

Counting multiples

Two sets

Exactly one

Smallest overlap

Answers and why: sets and Venn diagrams

Word problems, slips and formula cards

Counting in word problems

Ten slips to watch for

The formula cards

Your pace for this unit

A habit for this week

At least one girl

Repeats

Answers and why: word problems and slips

Self-check: can you do it?

Counting, probability and sets. This unit has one move: count by structure instead of listing.

Quantitative Aptitude Unit 10: Counting, probability and sets

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