"Let S $=\{$Barnsley$,$ Manchester United, Southend, Sheppey United, West Ham United, Golden Arrows, Bidvest Wits, Orlando Pirates, Dundee United, Lyon$\}$ be a universal set, A $=\{$Southend$,$ West Ham United, Golden Arrows, Orlando Pirates$\},$ and B $=\{$Barnsley$,$ Manchester United, Southend$\}.$ Find the number indicated.

n$($A$\text{'}\backslash$cap B$\text{'})$A search using a web search engine for "asteroid" yielded $10\mathrm{.}1$ million web sites containing that word. A search for "comet" yielded $26\mathrm{.}7$ million sites. A search for sites containing either "asteroid" or "comet" or both yielded $30\mathrm{.}2$ million sites. Assuming these search results represented actual numbers of sites containing the given words online, how many millions of web sites contained both words? HINT $[$See Example $1.]$

million sites"