$begingroup$ For (a), A simple way to take a look at is that you have decreased your chance space to only the combos that have at least 1 boy: 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 What we do to build the polyphase decimator is structure the small go FIR filter as essential for https://girlspginsector14gurgaon.blogspot.com/2025/07/find-ideal-boys-pg-in-gurgaon-sector-15.html