Question

if sigma n²=204 then n=​

Answer 1

Answer:

Input : n = 2

Output : 5

Explanation: 1^2+2^2 = 5

Input : n = 8

Output : 204

Explanation :

1^2 + 2^2 + 3^2 + 4^2 + 5^2 + 6^2 + 7^2

Answer 2

Step-by-step explanation:

$sigma \: n {}^{2} = \frac{n(n + 1)(2n + 1)}{6} = 204$

$n(n + 1)(2n + 1) = 204 \times 6$

$n(n + 1)(2n + 1) = 1224 \\ by \: hit \: and \: trial \: method \\ we \: get \: n = 8$