Question

the sales force a bussiness consists 10 men and 10 women. a production unit of 7 people are choosen at ramdon. what is the prob it will include 2 men and 5 women?

Answer 1

there are 10C2 ways of choosing 2 men.
there are 10C5 ways of choosing 5 women
there are 20C7 ways of choosing 7 people from 20 people.
multiply the first two and divide by the second.

Answer 2

what r u multoplying thou?

Answer 3

10c2 times 10c5 divided by 20c7

Answer 4

how do u do that on the calculator a reg one

Answer 5

105c5?

Answer 6

ok,
10C2 = 10*9/2!
10C5 = 10*9*8*7*6/5!
20C7 = 20*19*18*17*16*15*14/7!
remember that 7! = 7*6*5*4*3*2*1, then do what dhatraditya said

Answer 7

so u mutlply all those?

Answer 8

10c2= 45

Answer 9

10c5= 6048

Answer 10

10C5 = 252

Answer 11

http://www.youtube.com/watch?v=XqQTXW7XfYA&feature=related

http://www.mathsisfun.com/combinatorics/combinations-permutations.html

http://www.mathsisfun.com/combinatorics/combinations-permutations-calculator.html

see all the related videos from khanacademy too for permutations and combinations.

Answer 12

55814400 20c7

Answer 13

so now what?

Answer 14

6048*252/55814400 is your answer

Answer 15

1524096

Answer 16

45*252/77520= 1134/7752 = 567/3876 = 189/1292

Answer 17

=(10C2*10C5)/(20C7)

Answer 18

ah, I trusted prettychickas answer than 20c7 is 55814400

Answer 19

wait what

Answer 20

what r u multuplying everything

Answer 21

is it a decimal?

Answer 22

there are 10C2 ways of choosing 2 men.
there are 10C5 ways of choosing 5 women
there are 20C7 ways of choosing 7 people from 20 people.
multiply the first two and divide by the second

(10C2*10C5)/(20C7) = 45*252/77520= 1134/7752 = 567/3876 = 189/1292

Answer 23

so u devide those now?

Answer 24

It depends, what format is required? fractions are ok, so long as they are reduced.

Answer 25

ok so

Answer 26

i dont get it i am getting a decimal