Math

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

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  1. i think the answers are
    b
    c
    d

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  2. 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)

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  3. My answer is A

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  4. 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.

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  5. Wrong wrong and somewhat wrong!

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  6. nothing

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