Question: Let Xn = COS a) 1 b) -1 c) 0 d) 2 n 2 then limit supremum of the sequence is

Let Xn = COS a) 1 b) -1 c) 0 d) 2

 

Let Xn = COS a) 1 b) -1 c) 0 d) 2 n 2 then limit supremum of the sequence is

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