A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code? GMAT Explanation, Video Solution, and Additional Practice Questions!

A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different […]

M is the sum of the reciprocals of the consecutive integers from 201 to 300, inclusive. Which of the following is true?

M is the sum of the reciprocals of the consecutive integers from 201 to 300, inclusive. Which of the following is true? (A) 1/3 < M < 1/2 (B) 1/5 < M < 1/3 (C) 1/7 < M < 1/5 (D) 1/9 < M < 1/7 (E) 1/12 < M < 1/9 Correct Answer: A

M is the sum of the reciprocals of the consecutive integers from 201 to 300, inclusive. Which of the following is true? Read the Full Article »

If p is the product of the integers from 1 to 30

If p is the product of the integers from 1 to 30, inclusive, what is the greatest integer k for which 3^k is a factor of p? GMAT Explanation If p is the product of the integers from 1 to 30, inclusive, what is the greatest integer k for which 3^k is a factor of

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Work and Rate/Weighted Average

During a trip, Francine traveled x percent of the total distance at an average speed of 40 miles per hour and the rest of the distance at an average speed of 60 miles per hour. In terms of x, what was Francine’s average speed for the entire trip? GMAT Explanation, Video Solution, and More Practice!

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Last Sunday a certain store sold copies of Newspaper A

Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold

Last Sunday a certain store sold copies of Newspaper A Read the Full Article »

Andrew Geller

M is the sum of the reciprocals of the consecutive integers from 201 to 300, inclusive. Which of the following is true?

If p is the product of the integers from 1 to 30

Work and Rate/Weighted Average

Last Sunday a certain store sold copies of Newspaper A

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