What are all the possible combinations of 4 of A B C D E F G?

The possible combinations of 4 elements from the set {A, B, C, D, E, F, G} can be calculated using the combination formula (\binom{n}{r}), where (n) is the total number of elements and (r) is the number of elements to choose. Here, (n = 7) and (r = 4), resulting in (\binom{7}{4} = 35) combinations. These combinations include sets like {A, B, C, D}, {A, B, C, E}, and so on, covering all unique groupings of 4 letters from the 7 available.