A) \[-\frac{1}{(n-a)}a\]
B) \[\frac{a}{(n+1)}\]
C) \[\frac{a}{n}\]
D) \[\frac{n}{a+1}\]
Correct Answer: A
Solution :
[a] Let the C.M. be 'b'. Then, \[\frac{(n-1)mb+ma}{mn}=0\Rightarrow b=-\frac{1}{n-1}a\]You need to login to perform this action.
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