It's an actual exam question from the first exam, but it's one of the easier ones. IIRC the syllabus is something like 40% discrete probability and combinatoric

It's an actual exam question from the first exam, but it's one of the easier ones. IIRC the syllabus is something like 40% discrete probability and combinatorics, 40% univariate continuous probability, and 20% multivariate probability. But it's not like WSJ is going to expect its readers to do tabular integration in the margin. In general that exam is pretty representative of the syllabus of my mid-level undergrad probability theory class. The failure rate is somewhat inflated because students will walk right out of their probability class into the exam thinking they can pass without further studying. It's still harder than a typical undergrad exam, but it's nowhere near the level of the Putnam or whatever.