Posted by Ada on Tuesday, December 15, 2009 at 6:53pm.
There are two1s,two2s,andtwo 3s.There is one digt between the two1s,there are two digits between the two 2s, and there are three digits between the two 3s. Holding number cards can you duplicate this sequence of numbers
Extension: Can you continue this pattern all the way up two 7s?

Math  MathMate, Tuesday, December 15, 2009 at 8:33pm
I'll try the first part:
312132