+0  
 
0
57
1
avatar

Cannonballs are stacked in a pyramid shape with a triangular base of 5 cannonballs on a side.  How many cannonballs in all are in the stack? 

 Apr 1, 2020
 #1
avatar+111321 
+2

The number is  just  the sum of  the  first five triangular  numbers  = 

 

1  +  3  +  6  +  10  +  15   =

 

35

 

cool cool cool

 Apr 1, 2020

14 Online Users

avatar