" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
UN=a+(n-1)b
2000=5+(n-1)5
2000=5+5n-5
2000=5n
5n=2000
n=2000:5
n=400
Sn=1/2×n(a+UN)
=1/2×400(5+2000)
=200×2005=401000
= 5 + (n-1)5 = 2000
⇔ 5 + 5n - 5 = 2000
⇔ 5n = 2000 - 5 + 5
⇔ 5n = 2000
⇔ n = 2000/5
⇔ n = 400
Sn = n/2 (U1 + Un)
S2000 = 400/2 (5 + 2000)
s2000 = 200 x 2005
s2000 = 401000
ket = U1 = deretan barisan pertama
b = selisih bilangan suku yang berurutan
n = nilai bilangan suku ke berapa yang harus dihitung