IIM Bangalore (UGAT)

Arithmetic

Hard

$\frac{n(n+1)}{2}$

$\frac{(2n+1)}{3}$

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

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

✅ Correct Option: 1

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