$begingroup$ For (a), a straightforward way to have a look at is that you've got diminished your probability space to just the mixtures that have a minimum of one particular boy: This can be the identical chance of flipping a fair coin 8 occasions and receiving seven heads. It really https://pgingurugramforfemale.blogspot.com/2025/07/modern-boys-pg-in-gurgaon-sector-15.html