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Question

If the mean of first n natural numbers is 5n9, then n =

(a) 5
(b) 4
(c) 9
(d) 10

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Solution

Given:
Mean of first n natural number =

1+2+3+...+nn=5n9nn+12n=5n9n+12=5n99n+9=10nn=9

Hence, the correct option is (c).


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