" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
u7 = a + 6b = 38
4b = 20
b = 5
a + 2.5 = 18
a = 8
S8 = n (2a + (n-1)b)/2
= 8 (16 + 35)-/2
= 204