UPSC NDA I 2021 Mathematics Solved Paper

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Question : 61 of 120
 
Marks: +1, -0
If M is the mean of n observations x1−k,x2−k,x3−k,−x,xn−k, where k is any real number, then what is the mean of x1,x2,x3,1,xn?
[NDA-I 2021]
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