medium · GMAT Quant
For any positive integer n, the sum of the first n positive integers is dfracn(n+1)2. Rook Foundry asks for the sum of the reciprocals of the first 15 of these sums.
What is that total?
- dfrac1516
- 15
- dfrac158
- dfrac18
- dfrac21
Sign up free to see the explanation and track your rank →
More GMAT Quant practice
- Including both endpoints, how many distinct integer price points are in this range?
- Which of the following expressions must result in a positive value?
- Which property of arithmetic justifies that first step?
- Which of the following must also be an even integer?
- Which of the following inequalities correctly represents this range?
- Which of the following includes the number 0?
- How many unique meal combinations can a customer create?
- What is the probability that the lightbulb is functional?