B. 3.900
KPK = 3 dan 5 = 15
a = 210
Un = 390
Un = a + ( n - 1 ) b
390 = 210 + (n - 1) 15
n = 13
Sn = ½ n ( a + Un )
S13 = ½ x 13 ( 210 + 390 )
S13 = 3.900
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
B. 3.900
KPK = 3 dan 5 = 15
a = 210
Un = 390
Un = a + ( n - 1 ) b
390 = 210 + (n - 1) 15
n = 13
Sn = ½ n ( a + Un )
S13 = ½ x 13 ( 210 + 390 )
S13 = 3.900