Final answer:
The probability of being dealt a 'four of a kind' in poker involves calculating the combinations for four cards of the same rank and one additional card from the remaining cards.
Step-by-step explanation:
The probability of being dealt a four of a kind in a game of poker can be calculated by considering the ways to choose the four cards of the same rank and the final fifth card of a different rank. To calculate this probability, you should first determine the number of possible ways to get four of a kind out of 52 cards. There are 13 different ranks and for each rank, you can choose 4 cards in 1 way since you have to take all 4 cards of the same rank. After picking four cards of one rank, the remaining 1 card can be any one of the other 48 cards that are not of the same rank.