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Un = ar^(n-1)
=6.2^(n-1)
=6.2ⁿ .2^-1
=6.2ⁿ.1/2
=3.2ⁿ
U1 = 6 => 6 + 2(1^2 - 1)=>6 + 0
U2 = 12=> 6 + 2(2^2 - 1)=> 6 + 6
U3 = 24=>6 + 2(3^3 - 1)=> 6 + 18
Maka diperoleh:
Un = 6 + 2(n^2 - 1)