Question

Please Help!! Will fan and give medal! :D

There are 15 students in a social studies class. Two students will be selected to present their term projects today. In how many different orders can two students be selected?
840
105
420
210

Answer 1

i think its 15nCr2=105

Answer 2

@eHoaX How did you solve that.. I'm really confused on this.

Answer 3

are you taking statistics?

Answer 4

@eHoaX Well I'm taking algebra 2 and it's part of it.

Answer 5

So yes

Answer 6

@eHoaX

Answer 7

since there are 15 students and the order in which they are picked doesnt matter you can use the function nCr where n is the total number and r is the number of people in a group.