Ans:13 2) A mixed team of 10 players is chosen from a class of 30, 18 of whom are boys and 12 of whom are girls. In how many ways can this be done if the team has 5 boys and 5 girls?
Ans: 18!/13(5!)^2(7!) 3) A team of 4 is chosen from 6 married couples to represent a club. If a husband and wife can't be both in the team, how many ways can the team be formed?
Ans: 240 4) A box contains 10 bricks, identical except for colour. 3 are red, 2 are white, 2 are yellow, 2 are blue and 1 is black. In how many ways can 3 distinguishable bricks be...
a) taken from the box-
ans:74
b) arranged in a row
ans:444
*******Please show all workings!!
更新1:
i'm not lazy, i just want to get perfect in my test and i don't have enough time to do all the exercises....=]
更新2:
Ans No 1, I reported u!!!
