$begingroup$ For (a), an easy way to take a look at is that you have minimized your chance Place to only the combos that have at least one boy: – Baddioes Commented Jan 18 at 18:twenty $begingroup$ Basically , when implementing polyphase decomposed bandpass filter (taking into consideration sample conversion) https://www.tumblr.com/pginsector15gurugram/790285487683305472/book-modern-pg-for-boys-in-gurgaon-osmstays?source=share