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Question

In how many ways a committee of 6 people can be chosen from a panel of 13 people, if a certain person from 13 people must be on the committee?

A
13C5
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B
12C5
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C
13C7
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D
12C7
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Solution

The correct option is D 12C7
Total number of people n=13

We need to form a committee of 6 people from a panel of 13 people.

But, it is given that a certain person is already chosen from 13 persons and is also a member of the committee.

This implies that we need to choose only 5 people from a panel of 12 since a person is already selected from 13 people to form the committee.

r=5

5 people can be chosen from 12 people in 12C5 ways. If we do 13C5 then the person whose selection is certain will be repeated. Hence, we cannot do it.

But,

12C5= 12C125 ( nCr= nCnr)

12C5= 12C7=12!5! 7!


The number of ways in which a committee of 6 people can be chosen from a panel of 13 people if a certain person from 13 people must be on the committee is 12C5 or 12C7.

Therefore, option (b.) and (d.) are the correct answers.

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