$begingroup$ For (a), an easy way to look at is that you have lessened your likelihood space to only the combos which have not less than 1 boy: $begingroup$ In studies and psychological analysis, what's denoted by money $N$ vs lowercase $n$? If we go on that even further we https://1bhkflatonrentkirtinagargurgaon.blogspot.com/2025/07/find-ideal-boys-pg-in-gurgaon-sector-15.html