Edexcel IGCSE Math B 10.F addition rule
Practise addition-rule questions by identifying the outcomes included in either event and adding their probabilities without double counting.
- Syllabus
- First assessment 2018
- Course
- Math B 4MB1
Exam points
- Add probabilities for outcomes such as odd numbers or numbers less than 8.
- Use either-or wording to identify which outcomes belong in the combined event.
10.F Addition rule question 1
Table 1 gives information about the probability that a biased red six-sided dice will land on each of the numbers 1,2,5,7,9,11.
Question (a)
(a)
Calvin rolls the red dice once.
Calculate the probability that the red dice lands on:
[ 5 ]
Question (i)
(i)
either the number 2 or the number 5
[ 1 ]
Question (ii)
(ii)
an odd number
[ 1 ]
Question (iii)
(iii)
a number less than 8
[ 3 ]
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