combine_team.py

from itertools import combinations
from math import factorial


def count_combinations(n: int, r: int):
    return int(factorial(n) / (factorial(r) * factorial(n-r)))

team_count = 4

#          0    1    2    3    4    5    6    7    8    9    10   11
people = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l"]

result = tuple(combinations(people, team_count))
total = count_combinations(len(people), team_count)  # same as `len(result)`

# 1
comb1 = result[0]  # a, b, c, d

# 2
index1 = count_combinations(len(people)-1, team_count-1)
index2 = count_combinations(len(people)-4, team_count-1)  # 4 == 'e' index
comb2 = result[index1-index2]  # a, e, f, g

# 3
index1 = count_combinations(len(people)-1, team_count-1)
index2 = count_combinations(len(people)-7, team_count-1)  # 7 == 'h' index
comb3 = result[index1-index2]  # a, h, i, j

test comment

test.