Posted by **dddd47906** on Tuesday, July 22, 2014 at 4:15pm.

in a following pattern, one hexagon takes 5 toothpicks to build, two hexagons take 11 toothpicks to build, and so on. How many toothpicks would it take to build (a) 10 hexagons? (b) n hexagons?

a 50

b ???

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