Pentagonal number series is following – 1, 5, 12, 22, 35, 51, 70, 92, 117, 145, 176….
You need to write an Excel formula which can be dragged down and generates the above sequence.
The solution to this problem will be published after a month i.e. on 16-Aug-16.
Put this formula in A1 and copy down.
=(3*ROW()*ROW()-ROW())/2