1) $\left( \sqrt{\frac{225}{729} } - \sqrt{\frac{25}{144} } \right) + \sqrt{\frac{16}{81} } = ?$ A) $\frac{4}{15} $ B) $\frac{5}{16} $ C) $\frac{5}{17} $ D) $\frac{7}{16} $ Answer: Option BExplanation:Given exp = $\sqrt{\frac{225}{729} } - \sqrt{\frac{25}{144} } - \sqrt{\frac{16}{81} }$$= ( \frac{15}{27} - \frac{5}{12} ) + \frac{4}{9}$$= (\frac{15}{108} \times \frac{9}{4} )$$= \frac{5}{16}$
