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GRE Math Video Lessons: Series and Counting Basics
A relatively popular concept on the GRE math is series – when you have a list of numbers that follow a certain pattern(e.g. consecutive numbers). Usually, the question will ask you to add up all the...
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GRE Math Video Lessons: Advanced Series and Counting
What is the sum of the first 50 positive integers? (A) 1000 (B) 1225 (C) 1275 (D) 1400 (E) 1450 This is a daunting question, perhaps akin to the question that asks about two trains traveling at...
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Math Challenge Problem – A “Mean” Series
Set S consists of consecutive positive integers. If the lowest integer in Set S is 1 and the sum of the integers of Set S is 231, what is the median of Set S? 10.5 11 12 13 22 Explanation: One way to...
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Magoosh Brain Twister: Series Fun
As I promised, the Brain Twister is back in a bi-weekly format. Here is one that looks innocuous enough, but once you toy around with it for a few seconds you’ll see it’s anything but easy. The sum of...
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Magoosh Brain Twister: Series Fun – Explanation
Question Here’s the question from Monday: The sum of m consecutive integers is 8. If the sum of n consecutive integers is m, what is the value of n? (A) 15 (B) 16 (C) 31 (D) 32 (E) Cannot be...
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