Hey Aleksa. No it is correct as it is. As you can see the first part of the equations is just Eq. 5, which is: ** p(s=X, y=B)=N(s=X, y=B)/N**. The second part is only multiplication by [

**in the denominator and numerator.**

*n(s=X, y=B) + n(s=X, y= O)]*By doing so we get ** p(y=B|s=X)=N(s=X, y=B)/ [n(s=X, y=B) + n(s=X, y= O)]** and

**which yields**

*p(s=X)=[n(s=X, y=B) + n(s=X, y= O)]/N*

*p(s=X, y=B)= p(y=B|s=X)*p(s=X)*