" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
caranya:
beda = 28: (5-1) = 7
Sn = n/2 ( 2a + (n-1) b )
185 = 5/2 (2a + (5-1) 7)
370 = 5 ( 2a + 28)
370 = 10a + 140
10a = 230
a= 23
u2 = 23 + 7 = 30
dst.