Let us denote the fractional part of a real number $x$ by $\{ x \}$ (note: $\{ x \} = x - [ x ]$ where $[ x ]$ is the integer part of $x$ ). Then,
$$\lim _ { n \rightarrow \infty } \left\{ ( 3 + 2 \sqrt { 2 } ) ^ { n } \right\}$$
(A) equals 0 .\\
(B) equals 1 .\\
(C) equals $\frac { 1 } { 2 }$.\\
(D) does not exist.