On Tue, Nov 24, 2009 at 5:48 PM, Raul Miller <[email protected]> wrote: >>> F. Which students touched both locker 100 and 120? What do you >>> notice about their student numbers?" > > /:~ */ |: 2 3 5 ^"1 pfx 1 + 3 1 1 > 1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 > /:~ */ |: 2 5 ^"1 pfx 1 + 2 2 > 1 2 4 5 10 20 25 50 100
You computed the students for locker 100 and 120 individually, but the question was which students touched both lockers, that is, the intersection of these sets. divisors =: ](]#~0=]|[)>:@:i. divisors 120 1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 divisors 100 1 2 4 5 10 20 25 50 100 (divisors 120) (e.#[) (divisors 100) 1 2 4 5 10 20 divisors 20 1 2 4 5 10 20 Ambrus ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
