In the game of blackjack, the picture cards count as 10 points and the ace counts as either 1 or 11. All other cards are counted as their face value. Blackjack is achieved if 2 cards total 21 points. What is the probability of getting blackjack (sampling without replacement)?

I have a solution as follows,

P(blackjack)= (16/52)(4/52)= 0.0483

However, I don't have any idea about (16/52), where the 16 from? Please assist me with it, thank you