" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
b = 5
u12 = a + 11b = 62
a + 55 = 62
a = 62 -55 = 7 (jumlah kursi paling depan)
S12= 1/2n ( a + u120
= 1/2x12 ( 7 + 62)
= 6 (69) = 414