$begingroup$ For (a), a straightforward way to have a look at is that you've lowered your likelihood Place to only the combinations which have at the very least a person boy: What is the conventionally recognized usage of $N$ and $n$? Will it differ by subject? What means am i https://boyspgingurgaonsector14.blogspot.com/2025/07/find-ideal-boys-pg-in-gurgaon-sector-15.html