Please explain how this code works

Question

https://code.sololearn.com/cTDz0gmO2LMT/?ref=app

Answer 1

One, Two and Three aren't numbers, but strings (you see that from the quotes), which means they are treated as letters.

And for letters, if you add them, it makes sense that they just connect.

'a' + 'b' = 'ab'
'1' + '2' = '12'

Answer 2

Oh my how stupid i was busy doing all sorts of calculations, some probabilities tjoooooo. Thankyou so much HonFu