Question

If the mean of the first n natural number is 15, then find n.​

Answer 1

Step-by-step explanation:

The first n natural numbers are:

1, 2, 3, 4, ..........,n

Now, Mean = (1 + 2 + 3 + 4 +..........+ n)/n

=> 15 = (1 + 2 + 3 + 4 +..........+ n)/n

=> 15 = {n(n + 1)/2}/n

=> 15 = (n + 1)/2

=> n + 1 = 15 * 2

=> n + 1 = 30

=> n = 30 - 1

=> n = 29

So, the value of n is 29

Answer 2

Answer:

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