[detaro]

"subset S containing k (k > 6) of these 49 numbers", don't cut something important out of the statement and then argue it is "full of ambiguity".

[bogomipz]

I didn't cut anything out I actually reposted verbatim the entire problem description in my post. Or did you choose not to read that part?

[detaro]

I specifically meant the post I replied to (where I'd agree, just that piece would be ambiguous. The full one as quoted in your initial post is not, because the part I highlighted clarifies the meaning)