Recent content by charlieanne

Hi Soroban, Sorry, I should have been more clear: I did see that pattern (and also that the # of 3s goes up by two, and that the 2s go up 4,5,6,7,8,etc). I'm trying to understand why the formula tn=n2+3n works...I see that it does, just not how it works. (Example: I know that the formula for...

Hi, I did a search in the forums and found a similar problem, but nothing on this particular one. I have a problem asking for a procedure to find the number of toothpicks in any figure in a sequence, with an illustration that shows the first three figures of the sequence of triangles built with...