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ਕਦਮ ਦਰ ਕਦਮ

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

   Write the sum out.

2. 1 + 4 + 9 + 16 + \cdots

   The first few terms.

3. = \frac{n \left(n + 1\right) \left(2 n + 1\right)}{6}

   Closed form (a standard summation formula, provable by induction).

ਜਵਾਬ ਦਿਓ

\frac{n \left(n + 1\right) \left(2 n + 1\right)}{6}