" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
a3 = 45 = a1 * q^2
a6 = 1215 = a3 * q^3
45* q^3 = 1215 <=> q^3 = 27 <=> q = 3
45 = a1 * q^2 <=> 45 = a1 * 9 <=> a1 = 5
wzor na n elementów ciągu geom. to Sn = a1 * q^(n-1) więc:
S8 = 5 * 3^(8-1) = 10935
licze na naj:)