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  4. Let x=(9+4 √5)19, then x . x (where . denotes the fractional part of x ) is equal to:

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

Binomial Theorem

Solution:

Correct answer is (d) 1