" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Sn = 1/2 (117n - 5n²)
-36 = 1/2 (117n - 5n²)
-72 = 117n - 5n²
5n²-117n-72 = 0
(n-24)(5n+3) = 0
n-24 = 0
n = 24