0.9^18 -

Let’s calculate ( 0.9^{18} ) step-by-step.

We can compute stepwise:

First, ( 0.1853020188851841 \times 0.8 = 0.14824161510814728 ) Then, ( 0.1853020188851841 \times 0.01 = 0.001853020188851841 ) Add them: ( 0.14824161510814728 + 0.001853020188851841 ) Sum: ( 0.15009463529699912 ) 0.9^18

So:

[ 0.9^{18} \approx 0.1500946353 ]