A Senator Asks His Constituents to Rank Seven Issues in Order

question 146

Multiple Choice

A senator asks his constituents to rank seven issues in order of importance. What is the probability that one reply chosen at random will rank the issues in alphabetical order? ​

• A)Pr(Alphabetical Order) =
• B)Pr(Alphabetical Order) =
• C)Pr(Alphabetical Order) =
• D)Pr(Alphabetical Order) =
• E)Pr(Alphabetical Order) =

---

Definitions:

Isotope

Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number, but have the same number of protons in their nuclei.

Protons

Positively charged subatomic particles found in the nucleus of an atom, defining the element's atomic number.

Osmium

A dense, hard, bluish-white transition metal in the platinum group that is the most dense naturally occurring element.

Isotope

A variant of a particular chemical element which differs in neutron number, though it shares the same number of protons.