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​Q2. Mean of n items is  x . If these x items are successively increased by 2, 22 , 23 ,..... 2n then the new mean is 
         (A)    x  +  2 n   + 1 n                    (B) x  +   2 n + 1 n - 2 n             (C)  x 2 n n                    (D) None of these

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