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Tcecarenko [31]
2 years ago
11

a firm wants to select a group of 8 out of its 20 employees to attend a Business trip .in how many ways can this be done if ther

e is a couple who must not be separated​
Mathematics
1 answer:
inna [77]2 years ago
3 0

Answer:

Case 1 - 50388 ways when the couple is there in the group of 8 people selected out of 20 employees.

Case 2 - 75582 ways when the couple is not there in the group of 8 people selected out of 20 employees.

Step-by-step explanation:

Given

The couple within the group can not be separated and hence instead of taking total 20 employees , it must be taken as 19 employees.

Now if the couple is there in the selected group of 8 people, then total 7 needs to be selected out of 19 and hence the total number of ways of selecting 7 people out of 19 is

^7C_{19} = 50388

If the couple is not there in the selected group of 8 people, then the total number of ways of selecting 8 people out of 19 is

^8C_{19} = 75582

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Answer:

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Step-by-step explanation:

For problem number 1, Let's start by substituting all the x's for -3

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Now, lets simplify by solving the exponents

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Now we can solve

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