Answer:
It's the last option: 5^-5/6.
Explanation:
Converting to fractional exponents:
= 5^1/3 * 5^1/2 / 5^(5*1/3)
= 5^5/6 / 5^5/3
= 5^(5/6 - 5/3)
= 5(5/6 - 10/6)
= 5^-5/6
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