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9. A sequence of biased coins is flipped; the chance that the rth coin shows a head is Or, where Or is a random variable taking values in (0, 1). Let X, be the number of heads after n flips. Does Xn obey the central limit theorem when: (a) the O, are independent and identically distributed? (b) Or = O for all r, where O is a random variable taking values in (0, 1)