Edexcel IGCSE Math A 6.3.I Addition Rule for Mutually Exclusive Events

Practise adding probabilities of mutually exclusive outcomes and recovering missing category probabilities from a total of one.

Exam points

verify the outcomes cannot occur together before adding their probabilities
add the required mutually exclusive category probabilities for an either-or event
subtract known categories from 1 before combining an outcome with a missing category

[Maximum number: 1]

Fred has a fair six-sided dice and a fair spinner.

Fred throws the dice once.
He spins the spinner once.
The total score is the sum of the number the dice lands on and the number the spinner lands on.

Find the probability that the total score is 9 or 10

\frac{3}{24}

B1 oe ft table.

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