Andrew Geller

Andrew Geller is a top GMAT tutor based out of New York City. Throughout his career he has successfully taught people from many different backgrounds, countries, and starting scores.

A committee of 3 people is to be chosen from four married couples. What is the number of different committees that can be chosen if two people who are married to each other cannot both serve on the committee?

A committee of 3 people is to be chosen from four married couples. What is the number of different committees that can be chosen if two people who are married to each other cannot both serve on the committee? A. 16 B. 24 C. 26 D. 30 E. 32 GMAT combinatorics questions get demonized but […]

A committee of 3 people is to be chosen from four married couples. What is the number of different committees that can be chosen if two people who are married to each other cannot both serve on the committee? Read the Full Article »

The perimeter of a certain isosceles right triangle is 16 + 16√2. What is the length of the hypotenuse of the triangle? Three ways to solve this beast and a video solution!

(A) 8 (B) 16 (C) 4√2 (D) 8√2 (E) 16√2 A lot of people get this GMAT geometry question from the GMAT prep software wrong. It’s true that the algebra gets a little tricky but conceptually there’s not much going on. We just need some basic triangle rules and vocabulary (perimeter, isosceles, right triangle…) And,

The perimeter of a certain isosceles right triangle is 16 + 16√2. What is the length of the hypotenuse of the triangle? Three ways to solve this beast and a video solution! Read the Full Article »