$begingroup$ For (a), a straightforward way to have a look at is that you've got diminished your probability Area to just the combinations that have not less than just one boy: SMART Vocabulary: linked phrases and phrases Supporting and co-running abet accommodative any port in a storm idiom help assist https://affordable2bhkflatrentgurugram.blogspot.com/2025/07/book-affordable-1-rk-for-rent-in.html