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CAMBRIDGE ASSESSMENT INTERNATIONAL EDUCATION (CAIE)0580/41
Oct/Nov 2022 Paper 41 (Extended Structured) • IGCSE Mathematics (Extended)
base
[4 Marks]
1
Probability Trees & Conditional Chance
Worth 4 Marks • Challenging Level
A box contains 5 red balls and 7 blue balls. A ball is chosen at random and NOT replaced. A second ball is then chosen. Find the probability that both balls are of DIFFERENT colours. Express your answer as a percentage rounded to 1 decimal place.
Formula Guide:
P(Different) = P(Red, Blue) + P(Blue, Red) = (5/12 7/11) + (7/12 5/11).
Your Answer Entry
%
Enter digits with standard decimals or appropriate significant figures.
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