[Sum of first n odd number...] Sum of first n even numbers = ?

For Competitive Exams

Sum of first n even numbers = ?

Sum of first n odd number + n

Sum of first n natural numbers - Sum of first n odd numbers

Sum of first n odd numbers - n

Sum of first n odd numbers - Sum of first n natural numbers

Explanation:

Sum of first n even numbers = $n^{2}$ + n
Sum of first n odd numbers = $n^{2}$
So, sum of first n even numbers = Sum of first n odd number + n.

Additional Questions

If you find the sum of the squares of the first n natural numbers, which n gives you a sum of 1240?	Answer
Which one of the following is NOT a sum of squares of the first n natural numbers?	Answer
The ratio of squares of first n natural numbers to square of sum of first n natural numbers is 17:325. The value of n is:	Answer
The sum of the squares of the first 15 positive integers is equal to 1240. What is the sum of the squares of the second 15 positive integers?	Answer
If a and b are odd numbers, then which of the following is even ?	Answer
The sum of how many terms of the series 6 + 12 + 18 + 24 + ... is 1800 ?	Answer
Find the sum of the squares of first 45 even natural numbers.	Answer
If you find the sum of the cubes of the first n natural numbers, which n gives you a sum of 4356?	Answer
Which one of the following is NOT a sum of cubes of the first n natural numbers?	Answer
Sum of first n even numbers = ?	Answer

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