Analysis and Approaches for IBDP Maths Ebook 2 | Page 229

Chapter
16
16
Permutations and
Combinations
SUMMARY POINTs
�
Permutations and combinations when a sample of r objects are selected
from a set of n objects, 0 �r� n:
1.
2.
n
n!
Pr
� : Number of permutations when the order is taken into
( n�
r)!
account
n �n�
n!
Cr
�� ��
: Number of combinations when the order is not
�r � r!( n � r)!
taken into account
Solutions of Chapter 16
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