Question

What is 1+2+3+4+............+200?

Answer 1

Answer:

20100

Explanation:

Since we know that sum of 'n' consecutive natural numbers is n(n+1)/2, sum of 200 consecutive natural numbers is:

                                                              = 200(200+1)/2

                                                              = 100(201)

                                                              = 20100

Therefore, 1+2+3+4+............+200 is 20100.

Hope this helps you :)