Question

Which of the following expressions would give the number of ways to choose a group of 7 from a group of 15?

Answer 1

what are the expressions

Answer 2

What

Answer 3

is this a multiple choice questions?

Answer 4

No

Answer 5

lol this question doesn't make much sense...you said which of the following ways...what are the following ways??

anyway, the correct answer would be 15*14*13*12*11*10*9=15!/8!

Answer 6

use the combination formula

Answer 7

n choose k = n! / (k! ( n-k)!)

Answer 8

in this case your k = 7, and n = 15