" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
U20=100+(20-1)(-5)
U20=100+(19)(-5)
U20=100+(-95)
U20=5
jadi
S20=n/2(a+Un)
S20=20/2(100+5)
S20=10(105)=1050
jumlah 20 suku pertama adalah 1050