Code:

red = 5
blue = 3
green = 2
total = red + blue + green
not_red = blue + green
prob_not_red = not_red / total
print(f"total: {total}")
print(f"not_red: {not_red}")
print(f"prob_not_red: {prob_not_red}")

Output:

total: 10
not_red: 5
prob_not_red: 0.5