" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
1-(1/2)^n =80/81(1/2)^n= 1-(80/81)
((2)^(-1))^n=(81/81)-(80/81)
(2)^(-n)=1/81
2^(-n)=1/(3^4)
(2)^(-n)=3^(-4)
-n= ²log 3^(-4)
-n= -4 . ² log 3
n=4. ² log 3