Question

Hello,Can you help me with the following word problem?A medical researcher needs 6 people to test the effectiveness of an experimental drug. If 13 people have volunteered for the test, in how many ways can 6 people be selected?This might be using the nCr formula

Answer 1

Given that a medical researcher needs 6 people to test the effectiveness of an experimental drug. If 13 people have volunteered for the test, this implies that

`\begin{gathered} total\text{ number of options in the set = 13} \\ number\text{ of oprions to be chosen = 6} \end{gathered}`

To evaluate the number of people that can be selected, we use the combination formula expressed as

In this case,

`\begin{gathered} n=13 \\ r=6 \end{gathered}`

Thus, the question involves combination.