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View Full Version : What are the next 3 numbers in the sequence 1,11,21,1211,111221


spilbury
Sep 7, 2010, 01:44 AM

Unknown008
Sep 7, 2010, 10:20 AM
Have you tried reading the digits aloud? :)

ebaines
Sep 7, 2010, 10:20 AM
This is a classic riddle - one of my favorites. I won't give away the answer, but here's a hint - try sounding out each sequence in order, like this:

One
One one
Two one
One two one one

And another hint -- the next term in the sequence after 111221 starts with 3.

Good luck!

morgaine300
Sep 7, 2010, 09:05 PM
Isn't this the one we did on the riddle thread, that I couldn't figure out? And now I've forgotten already. LOL.

Unknown008
Sep 7, 2010, 09:46 PM
Yes, that's the very one, and I give the same hint every time :p

Alty
Sep 7, 2010, 10:05 PM
Ooh I know! I know!

When can we tell?

Unknown008
Sep 7, 2010, 10:10 PM
I'd say... until the OP posts an answer. This is, nonetheless homework :rolleyes:

Alty
Sep 7, 2010, 10:33 PM
How can this be math homework? There's no mathematical way to figure this out. :confused:

Unknown008
Sep 7, 2010, 10:35 PM
Well, my first supposition was because it's under the topic homework help... =/

Alty
Sep 7, 2010, 10:38 PM
Well, my first supposition was due to the fact that it's under the topic homework help... =/

Oh I agree, I'm just wondering why it's in Math & Science. If it's math, how could you figure it out mathematically? You can't. It's not an equation, the sequence cannot be deciphered using math.

I'd be more inclined to put it in English homework, but then that would mean the OP has the answer to the question. ;)

morgaine300
Sep 7, 2010, 11:00 PM
It might just be a math teacher trying to make people think a bit, or even extra credit. I could easily see a teacher doing this, yes. (But I would hope it wouldn't be for normal credit.)

aimee_tt
Sep 7, 2010, 11:35 PM
I know this! Good old Google LOL

Unknown008
Sep 7, 2010, 11:38 PM
I know this! Good old Google LOL

You cheated! :eek:

aimee_tt
Sep 7, 2010, 11:45 PM
Hehe Well not exactly I had an idea what it was.. I was wrong. But wanted to check it lol