How many ways can 3 students be chosen from a class of 20 to represent their class at a banquet?
A. 6,840
B. 3,420
C. 1,140
D. 2,280

You and 5 friends go to a concert. In how many different ways can u sit in the assigned seats?
A. 720
B. 120
C. 30
D. 15

You own 6 pairs of jeans and want to take 2 of them with you on vacation. In how many ways can you choose 2 pairs of jeans?
A. 10
B. 12
C. 15
D. 20

Question

How many ways can 3 students be chosen from a class of 20 to represent their class at a banquet?
A. 6,840
B. 3,420
C. 1,140
D. 2,280

You and 5 friends go to a concert. In how many different ways can u sit in the assigned seats?
A. 720
B. 120
C. 30
D. 15

You own 6 pairs of jeans and want to take 2 of them with you on vacation. In how many ways can you choose 2 pairs of jeans?
A. 10
B. 12
C. 15
D. 20

anonymous · Answer

@Caleb_Smith102 & @1351250faith

anonymous · Answer

ok take a guess for now

anonymous · Answer

idk it tho

anonymous · Answer

@ortiz09 & @khalilforthewin & @Caleb_Smith102

anonymous · Answer

@RoxyRae43

welshfella · Answer

number of combinations of  r from n is
     n!
------
r! (n-r)!

anonymous · Answer

?!

welshfella · Answer

n!  means n factorial

eg 5! = 5*4*3*2*1

welshfella · Answer

a simpler way of calculating  the number of combinations of 3 from 20 is

20*19*18
--------
3*2*1

welshfella · Answer

can you work that out - grab ur calculator

welshfella · Answer

are you there?
this is easy using a calculator

anonymous · Answer

i got it never mind buh thanks!

welshfella · Answer

yw

anonymous · Answer

:)