Question 936249
 2 boys can be selected out of 13 boys in 13c2 ways
  13c2  = {{{(13*12)/(2*1)}}}
         ={{{13*6}}}
         =78
1 girl can be chosen out of 18 girls in 18c1 ways
 18c1  =18/1 = 18 
   2 boys and 1 girl are chosen  in  78*18 ways
                               = 1404 ways
result : 1404 ways