Get detailed explanations to advanced GMAT questions.
If the sum of the consecutive integers from –42 to n inclusive is 372, what is the value of n?
Option D is the correct answer.
Number of terms =42+1+n=(n+43)
To find the sum = Formula = (n/2)(a+l), where n is the number of terms and ‘a’ and ‘l’ is the first term and last term.
42 terms after zero and 42 terms below zero will total 0. So, our new question will be consecutive integers with first term 43 have sum 372, what is the last term: ((43+n)/2)∗(n−43+1)=372 (n+43)∗(n−42)=744 n=50
- Of the 500 business people surveyed, 78 percent said that they use their laptop computers at home…
- If 0
- At a certain committee meeting only associate professors and assistant professors are present…
- In a particular machine, there are 2 gears that interlock; one gear is larger in circumference than the…
- A certain group of car dealerships agreed to donate x dollars to a Red Cross Chapter for each car…