Analysis and Approaches for IBDP Maths Ebook 1 | Page 237

Front Page
Chapter
18
Probability
18
SUMMARY POINTs
�
Terminologies:
1. U : Universal set
2. A : Event
3. x : Outcome of an event
4. nU ( ): Total number of elements
5. nA: ( ) Number of elements in A
�
Formulae for probability:
1. P( A� B) � P( A) � P( B) � P( A�
B)
2. P( A�) �1�
P( A)
3.
P( A�
B)
P( A| B)
�
P( B)
4. P( A) � P( A� B) � P( A�
B�)
5. P( A�� B�) � P( A� B) � 1
6. P( A� B) � P( A) � P( B)
and P( A�B) � 0 if A and B are mutually
exclusive
7. P( A� B) � P( A) � P( B)
and P( A| B) � P( A)
if A and B are independent
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