>>353
P(Alグー) = p
P(Alチー) = q
P(Alパー) = r
p+q+r=1

P(Blグー) = a
P(Blチー) = b
P(Blパー) = c
a+b+c=1

E(A) = 3*p*b + 6*q*c + 5*r*a
E(B) = 3*a*q + 6*b*r + 5*c*p

E(A)≧E(B)

3*p*b + 6*q*c + 5*r*a ≧ 3*a*q + 6*b*r + 5*c*p
a*(5r-3q) + b(3p-6r) + c(6q-5p) ≧ 0
5r-3q + b(3p+3q-11r) + c(-5p+9q-5r) ≧ 0
5r-3q + b(3-14r) + c(-5+14q) ≧ 0
q=5/14 , r=3/14 , p=6/14