Share
Explore BrainMass

Powers

If 9^9^9 is written out in the usual manner, how many digits will be needed?

Solution Preview

Assume that your question is (9^9)^9 which is equal to 9^81. Using Maple, we can get
9^81=196627050475552913618075908526912116283103450944214766927315415537966391196809
which includes 78 digits.
But if your question is 9^(9^9)=9^387420489, then the answer is not clear. I try to get it by using Maple ...

Solution Summary

How many digits will it take to represent 9^9^9 power?

$2.19