Use the formulas $\sum_{i=1}^{n} i=\frac{n(n+1)}{2}, \sum_{i=1}^{n} i^{2}=\frac{n(n+1)(2 n+1)}{6}$, and $\sum_{i=1}^{n} i^{3}=\left[\frac{n(n+1)}{2}\right]^{2}$ to find the sum.
-Find the sum of the first 275 positive integers.
A) $6,970,150$
B) 75,900
C) 37,950
D) $3,485,075$

Question

Quizplus · Accepted Answer

The sum of the first 275 positive integers is calculated using the formula $\sum_{i=1}^{n} i=\frac{n(n+1)}{2}$. Substituting $n=275$, we get $\frac{275(275+1)}{2} = \frac{275 \cdot 276}{2} = 37,950$.

Use the Formulas ∑i=1ni=n(n+1)2,∑i=1ni2=n(n+1)(2n+1)6\sum_{i=1}^{n} i=\frac{n(n+1)}{2}, \sum_{i=1}^{n} i^{2}=\frac{n(n+1)(2 n+1)}{6}∑i=1n​i=2n(n+1)​,∑i=1n​i2=6n(n+1)(2n+1)​ , And ∑i=1ni3=[n(n+1)2]2\sum_{i=1}^{n} i^{3}=\left[\frac{n(n+1)}{2}\right]^{2}∑i=1n​i3=[2n(n+1)​]2

Use the Formulas $\sum_{i=1}^{n} i=\frac{n(n+1)}{2}, \sum_{i=1}^{n} i^{2}=\frac{n(n+1)(2 n+1)}{6}$ , And $\sum_{i=1}^{n} i^{3}=\left[\frac{n(n+1)}{2}\right]^{2}$