$begingroup$ For (a), an easy way to have a look at is that you have diminished your chance space to just the mixtures which have at the least just one boy: – Baddioes Commented Jan 18 at eighteen:twenty $begingroup$ Mainly , when employing polyphase decomposed bandpass filter (considering sample conversion) https://boyspgingurgaonsector15.sport.blog/2025/07/29/trusted-girls-pg-in-gurgaon-sector-15-with-study-first-environment/