" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
b = 15 - 12 = 3
Sn = (n/2)(2a + (n - 1)b)
S10 = 5(2(12) + 9(3))
= 5(24 + 27)
= 5(51)
= 255
cara kerja :
U10 = a+(n-1)b
= 12 + (10-1) 3
= 12 + 9 . 3
= 12 + 27 =39
jadi jawabannya 12,15,18,21,24,27,30,33,36,39
jawabannya adalah 39