Answer:
To pull our the first chocolate, it would be a probability of 1/2.
To pull the second chocolate out, it would be a probability of 2/5.
Hope that helps, you just use ratios, the first cupcake needs to be chocolate, and there are 3 chocolate cupcakes out of the 6. Make that into a fraction 3/6, and simplify into 1/2.
The same goes for the second cupcake.