$begingroup$ For (a), a straightforward way to have a look at is that you've minimized your probability House to just the combinations which have at the least one boy: This is the same chance of flipping a fair coin eight situations and obtaining 7 heads. It's really not likely. 3. https://1bhkflatonrentkirtinagargurgaon.blogspot.com/2025/07/find-ideal-boys-pg-in-gurgaon-sector-15.html