If \(n\) is a positive integer, the sum of the integers from \(1\) to \(n,\) inclusive, equals \(\dfrac{n(n+1)}2.\) Whic

If \(n\) is a positive integer, the sum of the integers from \(1\) to \(n,\) inclusive, equals \(\dfrac{n(n+1)}2.\) Which of the following equals the sum of the integers from \(1\) to \(2n,\) inclusive?

A. \(n(n+1)\)

B. \(\dfrac{n(2n+1)}2\)

C. \(n(2n+1)\)

D. \(2n(n+1)\)

E. \(2n(2n+1)\)

Answer: C

Source: GMAT Paper Tests