Could you help with this question as it has me stumped! Solve for "N" 12nC2=N! Thanks Tutor 

Hi, Like a number of 'puzzlers' this is designed so you do NOT just use some standard algorithm. It is about patterns  ways of 'seeing' the pieces. Let me try to show you what I 'see':
Now, I know, from experience, that I should try to make the pieces look as much alike as possible, so I can focus on the differences:
I can make things look even more alike:
[That is based on recognizing that 6 is a factorial  something that also comes from experience and playing around.] I imagine you can see one answer already. The only other question would be  is it the only answer? I think if you play around with the shapes, say looking at the curves for the two functions on the two sides, you will see that they only cross 1 time  so you cannot be missing a second (positive) solution. Walter 

