At least one black and one red card in a hand of 5

[Micky1964]

Can anyone show me the error in my thinking here?

Answers from the textbook:


Thanks in advance. (Sorry about the blurry photo)

 

[Harry_the_cat]

But the "rest of the hands" also contains the "only red cards" hands. So you have to subtract 2 lots of 65780.

 

[Micky1964]

But the "rest of the hands" also contains the "only red cards" hands. So you have to subtract 2 lots of 65780.

Thank you...That seems so obvious now, don't know how I couldn't see it! Tired, maybe...