3 ( la n ) · 3⁸ = 3²¹ / [3¹⁸ /² ] = 3²¹ : 3⁹ = 3²¹ ⁻ ⁹ = 3¹²
3 ( la n ) = 3¹² : 3⁸ = 3¹² ⁻ ⁸ =3⁴
daca n = 4
8 = 2³ ; 4 = 2² ; 16 =2⁴
2 ( la n -1 ) = ( 2³ ) · (2² )³ ·( 2²⁰ ) ¹/² : [( 2⁴ )³ ·2⁵]
= 2³ · 2⁶ · 2¹⁰ : 2¹²⁺⁵
= 2 ³ ⁺ ⁶ ⁺ ¹⁰ : 2¹⁷
= 2¹⁹ ⁻ ¹⁷ =
= 2²
daca n -1 = 2 ; n = 3