" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
b = suku ke 2 - suku ke 1 = 5 - 1 = 4
Un = a + (n -1) b
U21 = 1 + (21-1)4
U21 = 1 + (20)4
U21 = 1 + 80 = 81