BArisan GeometriUn = a rⁿ⁻¹
dari barisan 2 , 1 , 1/2, 1/4 ,..., Un, maka Un = . .
a= 2r = u2/u1 = 1/2
un = a rⁿ⁻¹un = (2). (1/2)ⁿ⁻¹un = (1/2)⁻¹ (1/2)ⁿ⁻¹un = (1/2)ⁿ⁻²(D)
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BArisan Geometri
Un = a rⁿ⁻¹
dari barisan
2 , 1 , 1/2, 1/4 ,..., Un, maka Un = . .
a= 2
r = u2/u1 = 1/2
un = a rⁿ⁻¹
un = (2). (1/2)ⁿ⁻¹
un = (1/2)⁻¹ (1/2)ⁿ⁻¹
un = (1/2)ⁿ⁻²
(D)
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