+0  
 
0
46
4
avatar

Compute \(1 + 4 + 7 + \cdots + 94 + 97\)

 Sep 2, 2021
 #1
avatar
+1

$1 + 4 + 7 + \dots + 94 + 97 = \frac{n (2a + (n - 1) d)}{2} = \frac{32 (2 \cdot 1 + 31 \cdot 3)}{2} = 1520$

 Sep 2, 2021
 #2
avatar
0

Wait thats wrong

Guest Sep 2, 2021
 #3
avatar+114435 
0

Guest just made a mistake calculating n.   The rest is right

Melody  Sep 2, 2021

29 Online Users

avatar