Question

If the mean of the first n natural numbers is 15, then find n.
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Answer 1

Answer:

29

Explanation:

1+2+3+--------+n/n=15

we know that,

sum of n natural numbers is n(n+1)/2

so,

1+2+3+----------+n=n(n+1)/2

n(n+1)/2n=15

n+1=30

n=29

Answer 2

Answer:

29

Explanation:

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