Reina is buying a house with either brick or with siding, with 1 floor or with 2 floors, and in the city, the suburbs or the country. On top of that, she can choose from 6 different interior paints and 9 different exterior paints. Using the fundamental counting principle, simplify the expression

2(2)(3)

2(2)(3)(6)(9)

Reina decides she definitely wants a brick house with one floor. Now the number of possible combinations is

81

162

648
hurry please because the world might blow up