Even+Even=Even

Odd+Odd=Even

Odd+Even=Odd

(Odd+Odd)+(Odd+Odd)=Even+Even=Even

(Odd+Even)+(Odd+Odd)=Odd+Even=Odd

(Even+Even)+(Odd+Even)=Even+Odd=Odd

Hence, what type of selection of 4 numbers do we need such that the sum is Odd ?

How many of the primes you've listed are Odd?

How many are Even?