# Pentagonal Numbers - How To Proceed?

|| $$n$$ || Pentagonal Number || Additional dots || || 1 || 1 || || || 2 || 5 || $$5-1$$ || || 3 || 12 || $$12-5$$|| || 4 || 22 || $$22-12$$|| || 5 || ?? || ?? ||

When we go from the 4th to the 5th figure, how many more dots will we add?

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