" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Cara panjaaaannnggcari nilai u1
u1 = s1 = n/2 . (5n - 19)
u1 = 1/2 . (5.1 - 19)
u1 = -7
cari u2
s2 = 2/2 . (5 .2 - 19)
s2 = - 9
u2 = - 9 - ( -7)
u2 = -2
cari beda
b = u2 - u1
b = -2 - ( -7)
b = 5
nilai u 20
u20 = a + 19.b
u20 = -7 + 19 . 5
u20 = -7 + 95
u20 = 88
cara pendek
rumus
sn = n/2 . (5n - 19)
suku ke 20
U20 = S20 - S19
U20 = 20/2.(5.20 - 19) - 19/2 . (5.19 - 19)
U20 = 810 - 722
U20 = 88
U20 = 93