Peace of Mind Investments maintains a data base of companies they recommend to clients interested in investing only in organizations with the highest ethical standards. The most prominent companies listed in its data base are listed in the set

%0.

A search of the database for companies that have contributed to charitable causes yields the subset

%1.

Another search, this time for companies known for their low carbon footprints, yields the subset

%2.

A third search, for companies whose boards of directors have earned awards for ethical standards yields

%3.

1. #[Let $P$ be the set of those companies][Sea $P$ el conjunto de esos compañías]# %4:

#[Then][Entonces]# $n(P) = $BOX
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2. Let $Q$ be the set of those companies %5:

#[Then][Entonces]# $n(Q) = $BOX
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3. Let $R$ be the set of those companies %6:

#[Then][Entonces]# $n(R) = $BOX
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4. Let $T$ be the set of those companies %7:

#[Then][Entonces]# $n(T) = $BOX
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%8
#[Then][Entonces]# $n(%9) = $ BOX.

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