UPSC NDA I 2021 Mathematics Solved Paper
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Question : 61 of 120
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If M is the mean of n observations x 1 − k , x 2 − k , x 3 − k , − x , x n − k , where k is any real number, then what is the mean of x 1 , x 2 , x 3 , 1 , x n ?
[NDA-I 2021]
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