Can anyone explain why is the answer D?
Just consider 3 nos. for now
1 2 3
Double it,
2 4 6
Mean before - 2
Mean after - 4
Here B is greater
Consider another set
1 0 -1
Negative nos can be used since the statement only says they are distinct
Thus we’ll get Mean before and after as 0
Thus the ans is D
You can also consider a set of -1 -2 -3
And notice mean will be reduced.
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