Amedical research group plans to select 2 volunteers out of 8 for a drug experiment. in how many ways can they choose the 2 volunteers?

They can choose the 2 volunteers in 28 different ways

Step-by-step explanation:

Well, as the research group has to choose 2 volunteers out of 8, this means that it doesn't matter the order in which they choose them as long as they are two.

In statistics this is considered a counting technique and is called combination.

The combination formula is:

where

is the set of elements

and

is the number of elements taken from n

Then and

We replace in the combination formula:

This result means that Medical research group can choose the 2 volunteers in 28 different ways

$25 becasue a 10 increase would make it from 80 to 50