Which expression represents the sum of the first nnn terms of 0.1,0.01,0.001,…0.1, 0.01, 0.001, \dots0.1,0.01,0.001,…?
19(1−0.1n)\frac{1}{9}(1 - 0.1^n)91(1−0.1n)
110(1−0.1n)\frac{1}{10}(1 - 0.1^n)101(1−0.1n)
19(0.1n)\frac{1}{9}(0.1^n)91(0.1n)
1−0.1n1 - 0.1^n1−0.1n