Question one. There are four possible events each with a 25% possibility. An event happens. Of course there is 100% chance of one of the four events happening. There is no other possibility.

You have fourr cards (the four aces.) Each ahs a 25 % chance of being picked. You pick a card. Of course one of the aces has been picked.

Question two. You pick two cards What is the probablity of two cards being pick 100% of course. I think that you really wanted to ask a different question.

Question three. You pick four cards. What is the probablity that all the cards will be picked. Again 100% You had only foru cards so of course all are picked. Again I think you wanted to ask a different question but I am not sure what that question is.

You may want to replace the card after it is picked? You may want to ask something else.