羊车门问题
for i in range (1,x+1):
a = random.randrange(1,4)
b = random.randrange(1,4)
if a==b:
car1 = car1+1
elif a!=b:
car = car+1
print("更改后选中汽车的概率为",car/x)
print("不改选中汽车的概率为",car1/x)
a = random.randrange(1,4)
b = random.randrange(1,4)
if a==b:
car1 = car1+1
elif a!=b:
car = car+1
print("更改后选中汽车的概率为",car/x)
print("不改选中汽车的概率为",car1/x)