Math Problem Solving
posted by dddd47906 .
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 ???

I am not yet certain of the pattern, Frankly, I would have expected
one hexagon takes 6
two hexagon takes 11
three take 16
and n would take 6+(n1)5
10 hexagons would take 51