MathematicsIf the mean of first ‘n’ natural numbers is 11, thenn=

If the mean of first ‘n’ natural numbers is 11, then $n =$

A
22
B
12
C
21
D
10

Solution:

\frac{n + 1}{2} = 11 \Rightarrow n = 22 - 1

$n = 21$

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