[Solved] Redirection of stdout and stderr

WildGTX Asks: Redirection of stdout and stderr
I would like to redirect both the stdout and stderr of an executed file (file_1.txt) to another file (file_2.txt), and I would like to append this output to the file_2.txt contents. I have tried this:

$ ./file_1.txt >>&2 file_2.txt

That did not work. What am I doing wrong? What is the correct command?

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