" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Un = 4n - 1U1 = 4 . 1 - 1 = 4 - 1 = 3 = a = suku pertama
U2 = 4 . 2 - 1 = 8 - 1 = 7
U3 = 4 . 3 - 1 = 12 - 1 = 11
antara U1 dan U2 bedanya = 4
antara U2 dan U3 bedanya juga 4
ini artinya :
beda = 4 (aritmatika Tingkat 1 yg bedanya selalu sama)
Sn = n / 2 ( 2a + (n - 1) b)
S10 = 10 / 2 (2 . 3 + (10 - 1) x 4
= 5 ( 6 + 9 x 4)
= 5 x ( 6 + 36)
= 5 x 42 = 210
nilai deret aritmatika tsb adalah 210
bingung?? tanya di komentar yah!