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Which of the following statements are true?
(i) \beta(m, n) \in \mathbb{Q} if and only if
m,n \in \mathbb{Z^{+}}
(ii) \Gamma(n) \in \mathbb{Q} if and only if
n \in \mathbb{Z^{+}}
(iii) \beta(m, n) = \Gamma(n) if and only if
m=n=1
(iv) \beta(\frac{1}{6},\frac{5}{6})=2\pi