" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Un = ar^n-1
U4 = 4r^4-1
32 = 4r^3
8 = r ^3
r = 2
Un = ar^n-1
U2 = 4(2)^2-1
U2 = 4(2)
U2 = 8 = a
U3 = ar^n-1
U3 = 4(2)^3-1
U3 = 4(2)^2
U3 = 4(4)
U3 = 16 = b
a+b = U2 + U3 = 8 + 16 = 24