How is line 5 incorrect ? And how is line 18 correct ?

Hey Swarntam, Thank you for your question! Just as the explanation of the correct answer reads, the command on line 5, random.seed = 365, is not valid. The correct syntax would instead be random.seed(365). Regarding line 18, an f-string is used inside the print() function. It allows for putting values of variables inside the string itself. In this case the variable is {num_rounds}. This line of code is correct. Hope this helps! Kind regards, 365 Hristina