Question 761146
the average(arithmetic mean) is:

{{{(3^30+3^60+3^90)/3=8727963568087754817049672695886132766569299/3=2909321189362584939016557565295377588856433}}}

or, shorter

{{{(3^30+3^60+3^90)/3=(8.73*10^42)/3=2.91* 10^42}}}