Questions on Practice Exam Q6
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.
3 answers ( 0 marked as helpful)
Hristina Hristova
Instructor
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). 
Hristina Hristova
Instructor
Hey Maay,
Thank you for your reply!
Please, refer to this thread, where this is discussed and resolved :)
Kind regards,
365 Hristina