Question

英文数学概率题If three fair dice are thrown,and the sum is an odd n

Answer 1

A:the sum is an odd number,B:all three dice show an odd number

p(A)=0.5,p(B)=0.5^3,p(A|B)=1

p(B|A)=p(A|B)*P(B)/P(A)=1/4