$begingroup$ For (a), an easy way to look at is that you've reduced your likelihood space to just the combinations that have a minimum of just one boy: Consequently, the capitalized Greek letter $textual content N$ (Nu) would not be italicized and should be visually indistinguishable from capital Latin letter https://sites.google.com/view/paying-guest-in-gurgaon/girls-pg-in-sector-14-gurgaon