Question 1208429
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I solved this problem at this forum long time ago (8 - 10 years ago) and placed the solution as a lesson under this link


&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/misc/What-are-the-two-last-digits-of-the-number-3%5E123%2B7%5E123%2B9%5E123.lesson>What are the last two digits of the number 3^123 + 7^123 + 9^123 ?</A>  


with all necessary explanations.