Let G : Gold coins
S : Siler coins
A : 1st box
B : 2nd box
Assuming, selecting bags is of equal probability i.e. \(\frac{1}{2}\)
We want to find P(B|G), i.e. probability of selected gold coin is from the 2nd box
Conclusion: Therefore, the probability of selected gold coin is from the 2nd box is \(\frac{5}{9}\)