Which of the following gives the value of ?

MATHEMATICS · Single correct · ISC · Mathematics · Algebra · Algebra

Problem

Which of the following gives the value of

\displaystyle\sum_{k=1}^{n} k^{2}

? (a)

\dfrac{n(n+1)(2n+1)}{3}

(b)

\left[\dfrac{n(n+1)}{2}\right]^2

(c)

\dfrac{n(n+1)(2n+1)}{6}

(d)

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