Prime numbers 2 is the smallest prime number 2 is the only prime even number 1 is not a prime 3, 5, 7 are the only three consecutive odd integers that are each a prime. Digits In the integer 5,432, 5 is the thousands digit, 4 is the hundreds digit, 3 is the tens […]

# Archive | Factorials

## It’s Not An Excited Number; It’s a Factorial!

By Chris Lele on February 17, 2011 , UPDATED ON March 14, 2012, in *GRE Arithmetic, *GRE Math, Factorials

If you’ve ever come across a number with an exclamation mark in front of it, that’s the factorial sign, e.g. 5!. Factorials don’t come up too often on the GRE, and when they do, it’s usually on harder problems. Still, you don’t want to be faced with an exclamation sign next to a number and […]