A-Level Maths: M1-13 [Probability: Tree Diagram Example 2]

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Hi, does the final answer have to be a decimal or could you leave it as a fraction?

johnsergie

Sir I’m wondering why you didn’t use probability of (1/2 *1/100) in the final answer

mmbb

Sir, I have a trouble understanding when to add and when to multiply. How do I know which one to do?

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