Practice GMAT Questions

We provide hundreds of world-class practice GMAT questions with detailed explanations, study guides, and a GMAT practice test for free so that anyone can succeed on the GMAT.

Problem Solving Questions | Data Sufficiency Questions |
Sentence Correction Questions | Critical Reasoning Questions | Reading Comprehension Questions
rss GMAT Practice Question (One of Hundreds)
n1 = 145, n2 = 147, n3 = 149
The above is an arithmetic sequence. The nth term in this sequence is equal to n2. What is n?
Correct Answer: E
The equation for an arithmetic sequence is an = a1 + d(n-1)
  1. The equation for an arithmetic sequence is an = a1 + d(n-1) where d stands for the how much the sequence goes up each term while a1 stands for the first term in the sequence. Thus the equation of the above sequence is an = 145 + 2(n-1).
  2. Setting an to n2 gives us n2 = 145 + 2(n-1). This is a quadratic equation. Algebraic manipulation results in:
    n2 = 145 + 2(n-1)
    n2 = 145 + 2n - 2
    n2 - 2n - 143 = 0
  3. Factoring leads us to the equation
    (n + 11)(n - 13) = 0
  4. Thus our two solution are n = -11 and n = 13. There is no such thing as the -11 term in the sequence so n must be 13.

The best way to achieve a good score on the GMAT is to master the content tested on the GMAT and practice it extensively. We sincerely believe anybody can score a 700 or higher with enough practice and study of the content tested by the GMAT. In order to help you achieve a high score, we are pleased to provide you with a series of high-quality GMAT sample questions and detailed explanations for free. Written by our staff, these questions have helped countless students achieve a top score. In addition, we provide a daily GMAT practice question RSS feed.