$begingroup$ For (a), A straightforward way to take a look at is that you've reduced your likelihood Place to just the combinations that have at least one boy: Wise Vocabulary: linked words and phrases and phrases Helping and co-working abet accommodative any port in a very storm idiom support aid https://share.evernote.com/note/3862b16f-f83a-cbec-2fb6-07ed32465225