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 | Prime Numbers

## Prime Numbers and Probability – GRE Math Problem

By Chris Lele on May 18, 2011 , UPDATED ON April 3, 2012, in *GRE Arithmetic, *GRE Data Analysis, *GRE Math, Combinations and Permutations, Prime Numbers

Oftentimes, math problems will require that you know more than one concept. Sometimes, you’ll have to know the difference between an integer and a number in order to get the question right. Below, I’ve combined prime numbers with probability, two subjects already covered in this blog. The question below isn’t easy and actually takes a […]

## Think You Know Your Prime Factors?

By Chris Lele on February 9, 2011 , UPDATED ON October 11, 2018, in *GRE Arithmetic, *GRE Math, Prime Numbers

Here is a good problem to test your understanding of prime factors, not to add multiples. See if you can finish the problem in less than 2 minutes. If P is the product of all of the positive multiples of 11 less than 100, then what is the sum of the distinct prime factors of […]