probability?

1 ⤊

a school dragon boat crew requires 18 people.At least 9 of the crew are to be female.The final crew is selected from a squad of 10 females and 12 males.How many different final crew combinations can be selected?

2007-04-01 21:27:34 · 2 answers · asked by fashaleviana 1 in Science & Mathematics ➔ Mathematics

2 answers

Let
n = number of possible crews

You will have a crew of either

9 females and 9 males
or
10 females and 8 males

n = (10C9)(12C9) + (10C10)(12C8)
n = 10*220 + 1*495 = 2695

2007-04-01 22:21:15 · answer #1 · answered by Northstar 7 · 1⤊ 0⤋

so towards the end of the semester your brain is turning to mush??

2007-04-02 04:32:08 · answer #2 · answered by Jo Blo 6 · 0⤊ 1⤋