" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
225 = (n/2) * (2*1 + (n-1)*2)
450 = n (2+2n-2)
450 = 2n^2
225 = n^2
n = 15
U15 = 1+ 14*2 = 29
Maka suku ke-15 barisan tersebut adalah 29