Analysis and Approaches for IBDP Maths Ebook 1 | Seite 245

Front Page
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Paper 1 Section A – Probability with tree diagrams
Example
A bag contains 5 black balls and 2 white balls. Two balls are selected at random without
replacement.
(a)
Complete the following tree diagram.
[3]
18
(b)
Find the probability that exactly one of the selected balls is black.
[3]
Solution
(a)
Correct probabilities
A3
N3
[3]
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