求助一道數學題pp exam 6

ChrisYU924

six combinations:
V>C>S......[1];
V>S>C......[2];
C>V>S......[3];
C>S>V......[4];
S>V>C......[5];
S>C>V......[6];
therefore,
[4]+[6]=3/5*60=36;
[1]+[2]+[5]=1/10*60=6;
[1]+[2]+[3]=1/3*60=20;
so 2*([1]+[2])+[4]+[6]+[3]+[5]=36+6+20=62
therefore, [1]+[2]=2
choose A