52 * (1/1 + 1/2 + 1/3... +1/n), where n=52. This is the harmonic series. I didn't know off-hand of a formula for the sum of the harmonic series, so I searched, and apparently, there is no closed form formula for this. So you either have to actually calculate this number, or find an approximation.
52 * (1/1 + 1/2 + 1/3... +1/n), where n=52. This is the harmonic series. I didn't know off-hand of a formula for the sum of the harmonic series, so I searched, and apparently, there is no closed form formula for this. So you either have to actually calculate this number, or find an approximation.
Personally, I just plugged it into Wolfram alpha: http://www.wolframalpha.com/input/?i=1%2F1+%2B+1%2F2+%2B+.......
The result is, approximately, 4.538. And indeed, 4.538 * 52 = 235.976, which rounds down to 235 (not sure why the author rounded down).
Thanks for asking this!