" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Diketahui:b= 3
u1= 13
n= 25
ditanya: S25....?
jawab:
Sn= n/2 {2×u1+(n-1)b}
S25= 25/2 {2×13+(25-1)3}
S25= 12,5 (26+72)
S25= 12,5×98
S25= 1225