dakhan wrote:
i dont understand the purpose of the first statement portion of the question. how is that relevant to what the question is asking?
The purpose of the first sentence is two fold;
1) save you time adding consecutive odd integers
2) test quantitative reasoning.
That being said, it is not necessary to solve the problem, but it will save you a minute.
Here is how it breaks down:The sum of first N consecutive odd integers is N^2.There are 20 consecutive odd integers from 0-39.
Therefore,
The sum of the first
20 consecutive odd integers is
20^2Expressable as,
The sum of 1+2...39 = 400
or
20^2 = 400
What is the sum of all odd integers between 13 and 39 inclusive?What is the sum of 13+14+15...39?
Since
400 = [1+2...11] + [13+15...39]
We can reason that
364 = [6^2] - [20^2]