if $\dfrac{a}{b}$= $\dfrac{4}{5}$ and $\dfrac{b}{c}$=$\dfrac{15}{16}$,then the value of, $\dfrac{c^{2}-a^{2}}{c^{2}+a^{2}}$ is
$\dfrac{1}{7}$
$\dfrac{7}{25}$
$\dfrac{3}{4}$
$\dfrac{1}{4}$
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