A = \left\{\textrm{a U.S. birth results in twin females}\right\}
B = \left\{\textrm{a U.S. birth results in identical twins}\right\}
C = \left\{\textrm{a U.S. birth results in twins}\right\}
(a) State in words, the event A\cap{B}\cap{C}.
- A U.S. birth results in identical twin females.
(b) Find P\,\,\left(\!A\cap{B}\cap{C}\,\right).
- P\,\,\left(\!A\cap{B}\cap{C}\,\right) = \frac{1}{90}\cdot \frac{1}{3}\cdot \frac{1}{2}=\frac{1}{540}
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