What is the probability of receiving exactly 2 aces?

Assuming that you don't replace the card back into the pack; 

There are 4 aces in a standard 52 card deck; 

(4/52×3/51) <--- this number comes from the fact that there are now one less card in the pack, assuming that the card was an ace in the first draw 

Now calculate the answer and you get 0.0045 chance of receiving 2 aces in a row. 

Hope I helped :)