# Powers

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

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##### Solution Summary

How many digits will it take to represent 9^9^9 power is determined. The user manners are found.

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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 ...

###### Education

- BSc , Wuhan Univ. China
- MA, Shandong Univ.

###### Recent Feedback

- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
- "excellent work"
- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
- "Thank you"
- "Thank you very much for your valuable time and assistance!"

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