Count if Column A = X or Column A = Y

[Patman]

Please advise,

I have tried this but it appears to only count the second item.

Count({<[Column A]={'Open'},[Column A]={'Eff-Check'}>} [Column A])

also looking to solve, Count if Column B does not contain 13 where 13 is part of a string ( Like this 13OKabcedf, or 13NOKasdver) 

[Gysbert_Wassenaar · Accepted solution]

Just list the values separated by commas: Count({<[Column A]={'Open','Eff-Check'}>} [Column A])

And with the second condition for Column B: Count({<[Column A]={'Open','Eff-Check'}, [Column B] -= {"13*"} >} [Column A])