The conversation between human and AI assistant.
Two cards were drawn without a replacement from a pack of 52 cards. What is the probability that they are both kings or both queens?
That's interesting. Can you also tell me the formula used to calculate probabilities for this kind of problem?
Sure, the formula for calculating the probability of an event is the number of favorable outcomes divided by the number of possible outcomes. In this case, the number of favorable outcomes is 4C2 (which is equal to 6) + 4C2 (which is equal to 6), and the number of possible outcomes is 52C2 (which is equal to 1326).