I am reading some questions in Joshi's book on Quant Job Interview Questions, and am perplexed at some of the questions in the book.
Some of them are extremely easy (like, "explain the Black Scholes equation" or "write C++ code to compute Fibonacci numbers" or "why can't t you sort an array of length N in O(n)-time"). I could do this in my sleep.
But then there are these weirdo questions that require Stirling's approximation or knowing a power series expansion of $\sin x$. I mean, I know what's going on and I understand the solution to the questions totally, but ... I don't walk around with the power series expansion of $\sin x$ in my head, sorry I just don't.
There's even a question about contour integration (CONTOUR INTEGRATION!) in there. Here's the solution taken from the book:
WTF? Are you supposed to give this solution on a whiteboard at a job interview?
Are such questions actually asked? Why?