blackjack 52

Helpp meeee please … Blackjack?
How many ways can be treated in a blackjack dealer and the player has Blackjack in the first 2 cards? A. b. 3 x 15 4 x 4 c. 52! / (2 "x 50") D. 4 x 10 e. None of these answers. What is the correct answer? Can you explain please .. I do not know what natural blackjack mean?
If it is because the player has Blackjack, should not be included in the calculations unless you use a single deck and you need to account for the ten missing and ACE. The odds of blackjack are very close to 20:1 on average.
Black Jack Ep52 Pt1