There are 20 people in Seokjin's class. If you are trying to pick 11 people to play in a soccer tournament, what are possible cases to pick a team?
20 11 [OP_COMB]
var_a = 20
var_b = 11
var_c = 1
var_a = int(var_a)
var_b = int(var_b)
for i, elem in enumerate(range(var_b)):
    var_c = var_c * (var_a-i)
for i, elem in enumerate(range(var_b)):
    var_c = var_c / (i+1)
print(int(var_c))