Answer:
Below
Explanation:
There are 13 spades 13 hearts 13 diamonds and 13 clubs in the full 52 deck
1st card spade 13 / 52
now there are only 51 cards lefts 13 are hearts
second card hearts 13 / 51
now there are 50 cards left 13 are diamonds
third card diamond 13/50
similarly for the fourth card = 13 / 49
Final prob = 13/52 * 13/51 * 13/50 * 13/49