Product rule for counting

For this question we need to see if a number x 15 will be equal to 17. If there is, Jeff is correct. However since there isn’t, Jeff is incorrect

The difference between this and the sandwich question is that matches happen at the same time and also in reverse but you cannot eat two different sandiwches at the same time

The reason why it’s 51 and not 50 is because we’re not picking 2 at the same time. 1 card to Jay, then another card to Jay.