1? + 2? + 3? = 51. 2? - 1? = 4. List 1?, 2?, 3? in the format of 1?,2?,3? without spaces. (Find 1?,2?,3? in integer form)

Step-by-step explanation:

To calculate combinations, we will use the formula nCr = n! / r! * (n - r) !, where n represents the number of items, and r represents the number of items being chosen at a time. To find the probability of an event, you may have to find the combinations.