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Re:A “simple” 3rd grade problem by jasomill on Saturday May 04, 2013 @06:19PM (#5656514)
So does considering simpler cases of two posts (3), three posts (3 + 3), and four posts (3 + 3 + 3), then discovering the pattern (3(n - 1)).
Re:A “simple” 3rd grade problem by keithpeter on Sunday May 05, 2013 @05:55AM (#5657971)
Yes when teaching GCSE here in the UK where there is an algebra component.

I've also had students in Functional Maths classes just sketching arrangements of posts and counting the spaces.