Hi, I am not sure why the equation of Combination with repetition was = (n+p-1)! / p! NOT =(n+p-1)! / p! (n-1)! as stated in the lecture and PPT. Kindly explain. Thanks.

Hey Maay, Thank you for your question! Could you please let us know where you find the inconsistency? In the video lecture, on timestamp 6:43 - 7:07, I can see the correct formula being used, namely: Please, let me know if you encounter any mistakes. Kind regards, 365 Hristina

Thanks, Hristina for the clarification. The answer to Q6 of practice exam used a slightly different formula for combination with repetition (attached below).