Write the sum of first `n` even natural numbers.

Find the sum of first 10 even natural numbers.

Write the sum of first n odd natural 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.

(i) Find the sum of first 200 even natural numbers. (ii) Find the sum of all numbers lying between 201 and 424 which are divisible by 5. (iii) Find the sum of all numbers from 1 to 200 which are divisible by either 2 or 3.

Find the sum of first n natural 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.

If the sum of first n even natural numbers is 420, find the value of ndot

Find the sum of first 100 even natural numbers which are divisible by 5.