Yes, zero is divisible by every
integer, with one exception: nothing is divisible by zero. Zero divided by three is, of course, zero, which is an integer; therefore zero is divisible by 3.
Nov 2011: After years of development, I am now making my advanced Quant books and high-level problem sets available for sale. Contact me at ianstewartgmat at gmail.com for details.
Private GMAT Tutor based in Toronto