" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
selisih ( beda) = 3
ditanyakan
jika dlm gedung pertemuan ada 10 baris kursi, maka jumlah seluruh kursi adalah?
jawab
maka Sn
Sn = n/2 (2a+(n-1)b)
S10 = 10/2 ( 2 × 10 + (10-1)3)
S10 = 5 (20 + ( 9 × 3)
S10 = 5 ( 20 + 27)
S10 = 5 (47)
S10 = 235 (b)