Math

posted by .

Out of 4 architects, 6 engineers and 9 electricians, how many ways can a group of 6 people be formed to attend a forum if:
a. there is an equal number of architects, engineers and electricians
b. two particular engineers cannot be in the committee?
c. there are at least 3 electricians?

• Math -

a. equal number of each
Combinations again..

architects 4!/(2!2!)

engineers 6!/(2!4!)

electricians 9!/(2!7!)

b. remove the 2 engineers from the choices which would leave 4 architechts, 4 engineers and 9 electricians Now, we have 17 to choose from to make a group of 6.

17!/(6! 11!)

• Math -

Thanks much :)

Similar Questions

1. Math

Out of 4 architects, 6 engineers and 9n electricians, how many ways can a group of 6 people be formed to attend a forum if there are at least 3 electricians?
2. Statistics

Out of 4 architects, 6 engineers and 9n electricians, how many ways can a group of 6 people be formed to attend a forum if there are at least 3 electricians?
3. ap stats

two different sections of electricians took their state license test. the first section consisted of 75 applicants having an average score of 262 and a sample standard deviation of 35. they were journeyman, experienced electricians …
4. class

Suppose that the scores of architects on a particular creativity test are normally distributed. Using a normal curve table, what percentage of architects have Z-scores: Above .10?
5. Math

Two people are selected at random from a group of 6 pilots and 4 engineers. What is the probability that both of them are engineers?
6. Math Help

Two people are selected at random from a group of 6 pilots and 4 engineers. What is the probability that both of them are engineers?
7. math

It takes 15 electricians 24 days to wire a new housing subdivision. How many days would 18 electricians require to do the same job?
8. math

It takes 15 electricians 24 days to wire a new housing subdivision. How many days would 18 electricians take to do the same job?
9. math

It takes 18 electricians 35 days to wire a new housing subdivision. How many days would 28 electricians require to do the same job?
10. Math

It takes 15 electricians 24 days to wire a new housing subdivision. How many days would 18 electricians take to do the same job?

More Similar Questions