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.

If each term in the sum a1 + a2 + a3 +…+ an is either 7 or 77 and the sum equals 350, which of the following could be equal to n?

A. 38 B. 39 C. 40 D. 41 E. 42 Stumped by this GMAT sequence puzzle from the GMAT Prep tests 1 and 2? We’ve got you covered! We’ll do a quick overview on sequences so you have a sense for what this means: If each term in the sum a1 + a2 + a3 […]

If each term in the sum a1 + a2 + a3 +…+ an is either 7 or 77 and the sum equals 350, which of the following could be equal to n? Read the Full Article »

In a village of 100 households, 75 have at least one DVD player, 80 have at least one cell phone, and 55 have at least one MP3 player. If x and y are respectively the greatest and lowest possible number of households that have all three of these devices, x – y is:

In a village of 100 households, 75 have at least one DVD player, 80 have at least one cell phone, and 55 have at least one MP3 player. If x and y are respectively the greatest and lowest possible number of households that have all three of these devices, x – y is: A. 65

In a village of 100 households, 75 have at least one DVD player, 80 have at least one cell phone, and 55 have at least one MP3 player. If x and y are respectively the greatest and lowest possible number of households that have all three of these devices, x – y is: Read the Full Article »

If is n is multiple of 5, and n=p^2*q where p and q are prime, which of the following must be a multiple of 25?

If is n is multiple of 5, and n=p^2*q where p and q are prime, which of the following must be a multiple of 25? A. p^2 B. q^2 C. pq D. p^2*q^2 E. p^3*q Correct Answer: D Full explanation coming soon. Send us a note if you’d like this added to the express queue!

If is n is multiple of 5, and n=p^2*q where p and q are prime, which of the following must be a multiple of 25? Read the Full Article »