Number of people in the audience = 250
Number of volunteers required to perform the magic act from the audience =2
As 2 people can be selected from 250 people by using the properties of combination as order of choosing people is not important.
Possible number of ways = [tex]_{2}^{250}\textrm{C}[/tex]
= [tex]\frac{250!}{2!\times 248!}=249 \times 125=[/tex]
= 31125 ways
