If the arithmetic mean of two numbers a and b, a > b > 0, is five times their geometric mean, then ${{a + b} \over {a - b}}$ is equal to :

Question

${{\sqrt 6 } \over 2}$

${{3\sqrt 2 } \over 4}$

${{7\sqrt 3 } \over {12}}$

${{5\sqrt 6 } \over {12}}$

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