Respuesta :
You didn't supply any expressions, but it'd be one of these (assuming it's unique combinations, rather than the duplicate permitting permutations):
(15!)/(7!(15-7)!)
or
(15!)/(7!8!)
or
(15•14•13•12•11•10•9)/(7!)
or
(15•14•13•12•11•10•9)/(7•6•5•4•3•2)
or
32432400/5040
or
6435
depending on what it has as possible answers.
(15!)/(7!(15-7)!)
or
(15!)/(7!8!)
or
(15•14•13•12•11•10•9)/(7!)
or
(15•14•13•12•11•10•9)/(7•6•5•4•3•2)
or
32432400/5040
or
6435
depending on what it has as possible answers.
The formula is ¹⁵C₇. Then the number of ways to choose a group of 7 from a group of 15 will be 6435.
What are permutation and combination?
A permutation is an act of putting things or elements in the right sequence. Combinations are a method of picking things or pieces from a collection of objects or sets when the sequence of the objects is irrelevant.
Then the number of ways to choose a group of 7 from a group of 15 will be given by the combination formula.
Then we have
Number of ways = ¹⁵C₇
Number of ways = 6435
More about the permutation and the combination link is given below.
https://brainly.com/question/11732255
#SPJ2
