Randomly take 4 cards from a deck of 52 cards, find the probability that the 4 cards are all aces

You would divide the number of aces in a deck, which is 4, ny 52 which will give you about 0.0769. As a percentage it will be 7.69%. Round it off to 7.7% if you like. It’s either 7.7% it 7.69%.