Good permutations and combinations problems book

[toforfiltum]

I want to get better at this topic and I have trouble finding good questions apart from past year exam questions. I am currently an A- Level student, so can someone recommend me a good book full of challenging questions at my level?
To give you some idea of the types of questions in the exam, here are some:

Any suggestions would be much welcomed and appreciated!

 

[RUber]

I recently used Walpole and Myers book for Prob and Stats which had rather clear and concise explanations for combinations and such. Maybe not too heavy on sample problems, but it might be helpful nonetheless. Chapter 2 section 2 is all about combinations and permutations.

I found an online pdf here: http://folk.ntnu.no/jenswerg/40CEFd01.pdf

Or you can support the authors and purchase here: https://www.amazon.com/dp/0321629116/?tag=pfamazon01-20

 

[toforfiltum]

I recently used Walpole and Myers book for Prob and Stats which had rather clear and concise explanations for combinations and such. Maybe not too heavy on sample problems, but it might be helpful nonetheless. Chapter 2 section 2 is all about combinations and permutations.

I found an online pdf here: http://folk.ntnu.no/jenswerg/40CEFd01.pdf

Or you can support the authors and purchase here: https://www.amazon.com/dp/0321629116/?tag=pfamazon01-20

Hey, thanks a lot for the links! The book is useful for other topics that I'm learning too.