 Hello and welcome to the session. The question says, four cards are drawn from a well-shuffled deck of 52 cards. What is the probability of obtaining three diamonds and one spade? So let's start with the solution. Now a deck of 52 cards, 13 diamond cards, 13 spade cards. Now the question further says four cards are drawn from a well-shuffled deck of 52 cards. So this implies total number of possible outcomes is equal to 52 C4. This is the total possible number of possible outcomes when four cards are drawn from 52 cards. Now let us denote the event E by three diamonds one spade card. The number of favorable outcomes is equal to 13 C3. Since three diamond cards are drawn and there are 13 diamond cards in the deck of 52 cards into one spade card is also drawn. So we have 13 C1. Since again there are 13 spade cards and out of these 13 the possible number of favorable outcomes are 13 C1. Therefore probability of the event E that is probability of obtaining three diamonds and one spade card is equal to the number of favorable outcomes upon the total number of possible outcomes. So this is further equal to 13 C3 into 13 C1 upon 52 C4. Hence our answer is the probability of drawing three diamonds and one spade card is 13 C3 into 13 C1 upon 52 C4. So this is our answer. This completes the session. Hope you have understood it well. Have a nice day.