Question

Let $x=(9+4\sqrt{5}{)}^{19}$, then $x.\{x\}$ (where $\{.\}$ denotes the fractional part of x$ ) is equal to:

• A. $2^{19}$
• B. $3^{19}$
• C. 0
• D. 1

Answer 1

Answer: (D)

Correct answer is (d) 1