A) 7
B) 8
C) 9
D) 11
Correct Answer: C
Solution :
Mean of first 9 natural numbers \[=\frac{1+2+.....+9}{9}=\frac{45}{9}=5\] Given mean of first 9 natural numbers is\[\frac{5n}{9}\]. \[\Rightarrow \]\[\frac{5n}{9}=5\] \[\Rightarrow \] \[n=\frac{9\times 5}{5}=9\]You need to login to perform this action.
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