Option 1 suggests that there is a 100% probability, which would mean that the coin is guaranteed to be gold. Option 3 suggests a 25% probability and option 4 suggests a 75% probability. However, the correct answer is option 2, which suggests a 50% probability. Here is how:

Seeing a silver coin narrows down the possibilities. The table is either the one with two silver coins or the one with a silver coin and a gold coin. Given these two equally likely possibilities, there`s a 50% chance that the other drawer has a gold coin. This is because there is only one situation (of the two possible scenarios) that has a gold coin in the other drawer. If it were the table with two silver coins, obviously, the other drawer would also hold a silver coin. So, there is a 0.5 or 50% chance that the other coin is gold, hence option 2 is the correct answer.