每次尝试（每次你抽5颗弹珠）你都需要计算红色和绿色的数量。如果正好2颗是红色，3颗是绿色，增加你的total计数器。

import random

random.seed(42)

total = 0
trials = 10000

for _ in range(trials):

    red = 0
    green = 0

    draw = random.sample(range(1, 31), 5)
    for m in draw:
        if m <= 10:
            # we'll say marbles 1-10 are red, 11-30 are green
            red += 1
        else:
            green += 1

    if red == 2 and green == 3:
        total += 1

print(total / trials)