Which of the following expressions represents the sum in terms of ?

MATHEMATICS · Single correct · CBSE · Mathematics · Number Play · Number Play

Problem

Which of the following expressions represents the sum

1 + 2 + 3 + \dots + n

in terms of

n

? (a)

n(n+1)

(b)

\dfrac{n(n-1)}{2}

(c)

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

(d)

\dfrac{n^{2}}{2}