18 A studio need 3 actors for their short comedy film The 6

18. A studio need 3 actors for their short comedy film . The 6 actors availible are Moe, larry, curly, shemp, joe, and curly joe.

please correct this one this is for Algebra 2, and or trig

Solution

Here   n= 50

sigma( s.d) = sqrtn/2 = sqrt50/2 = 5/sqrt/2 = 2.5sqrt2=3.53

b) 6c3= 6!/3!*3! = 6*5*4*3!/3!*3!

=120/6=20   answer