Tīpoka ki ngā ihirangi matua
Tauwehe
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Aromātai
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

\frac{2\times \left(\frac{3}{2}\right)^{n+1}-3-2\times 3^{n}+2\times 2^{n}}{2}
Tauwehea te \frac{1}{2}.