The Basics of Counting (Junior Cert Mathematics): Flashcards

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The Fundamental Principle of Counting
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Fundamental Principle of Counting method

Multiply number of choices together

If event has mm outcomes, another nn outcomes, total?

m×nm \times n

3 shirts × 2 trousers × 2 shoes = ?

3×2×2=123 \times 2 \times 2 = 12 outfits

2 starters × 3 main courses = ?

2×3=62 \times 3 = 6 meals

4 activities × 3 lunch × 2 desserts = ?

4×3×2=244 \times 3 \times 2 = 24 day-out plans

3 destinations × 2 accommodation × 3 activities × 2 transport

3×2×3×2=363 \times 2 \times 3 \times 2 = 36 vacation packages

Purpose of Fundamental Principle of Counting

Solve counting problems quickly

Operation in Fundamental Principle of Counting

Multiplication

Exam tip for tricky counting problems

Draw it out or make a list

Before multiplying in counting problems, do what?

Check your steps, include all parts

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