Pentagonal Numbers - How To Proceed?

Probability Level 1

|| nn || Pentagonal Number || Additional dots || || 1 || 1 || || || 2 || 5 || 51 5-1 || || 3 || 12 || 12512-5|| || 4 || 22 || 221222-12|| || 5 || ?? || ?? ||

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

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