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CHAPTER 5
A Mathematics Society committee consists of a president, a vice-
Example 1
president, a secretary and a treasurer. How many ways can such a
committee be chosen from 45 members?
OPERATION
1. To determine
SHIFT
4
5
This means that there are 3,575,880 ways to form the committee.
A group of five students is to be chosen from a class of 30 for a debate.
Example 2
In how many ways can such a group be formed?
OPERATION
1. To form a combination of any five students from 30 students, press
3
0
nCr
This means that the number of combination is 142,506.
SHIFT
MODE
Pressing
to its default mode: COMP mode.
Permutations and Combinations
nPr
=
nCr
4
=
5
=
3
will erase all memory and return the calculator
45P4
3,575,880
30Ç5
142,506
15
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