Math
posted by Anonymous .
How many ways can 3 students be chosen from a class of 20 to represent their class at a banquet? (1 point)
6,840
3,420
1,140
2,280
15. You and 3 friends go to a concert. In how many different ways can you sit in the assigned seats? (1 point)
a.6 ways
b.12 ways
c.24 ways
d.10 ways
16. You own 5 pairs of jeans and want to take 2 of them on vacation. In how many ways can you choose 2 pairs of jeans? (1 point)
a.10 ways
b.15 ways
c.4 ways
d.20 ways

i think the answers are
b
c
d 
1st one:
choose 3 from 20
= C(20,3) = 1140
15.
Assigned seats > order matters, so permution of 4
= 4x3x2x1 = 24
(you were right)
16.
choose 2 from 5
= C(5,2) = 10
(the order you select your jeans does not matter) 
My answer is A

My question was: "How many students can be chosen from a class of 16 to represent their class at a banquet?"
If you could give me the answer, I'd be thankful. 
Wrong wrong and somewhat wrong!