Compute \(1 + 4 + 7 + \cdots + 94 + 97\)
$1 + 4 + 7 + \dots + 94 + 97 = \frac{n (2a + (n - 1) d)}{2} = \frac{32 (2 \cdot 1 + 31 \cdot 3)}{2} = 1520$
Wait thats wrong
Guest just made a mistake calculating n. The rest is right
Reposted here.
https://web2.0calc.com/questions/melody-please-help-i-just-want-to-know-how-to-start
