" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Banyak suku awal n = 2
Banyak suku baru n = n + (n-1)k = 2+(2-1)10=12
sehingga Un = U12 =110
Jumlah deret:
Sn = (n/2) (a+Un) = (12/2)(60+110) = 6×170=1020