That's what's wrong, it's NCR

6 D in an S = six decks in a shoe

1) 8 H&C on a PC
2) 20 N makes a D
3) 2800 RC in a RR
4) 6 S on a D
5) 52 C makes a D

And finally the totally obscure casino quiz question.

4 C in E

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The only thing I can say Paul, is you were not brought up a musician? ;-)