Find the sum of the first n odd numbers

Find the sum of first n odd natural numbers.

Find the sum of first n natural numbers.

Find the sum of first n natural numbers.

Find the sum of first n natural numbers.

Find the median of first 15 odd numbers.

Statement 1 The difference between the sum of the first 100 even natural numbers and the sum of the first 100 odd natural numbers is 100. Statement 2 The difference between the sum opf the first n even natural numbers and sum of the first n odd natural numbers is n.

let S_(n) denote the sum of the cubes of the first n natural numbers and s_(n) denote the sum of the first n natural numbers , then sum_(r=1)^(n)(S_(r))/(s_(r)) equals to

Let S_n denote the sum of the cubes of the first n natural numbers and s_n denote the sum of the first n natural numbers. Then sum_(r=1)^n S_r/s_r is equal to

If the sum of the first n natural numbers is 1/5 times the sum of the their squares, the value of n is -

Write the sum of first n odd natural numbers.