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Archive | Series and Sequences

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 varying rates headed in the same direction. Just like the speeding locomotive question, this type of question should […]

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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 numbers that are part of the series. Today, we are not going to go quite so far. Instead, we are going […]

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