Question

if we start counting all natural number upto 1000 then what will be the sum of all these numbers​

Answer 1

The answer will be undefined

Answer 2

Answer:

We represent the numbers from 1 to 1000

1, 2, 3, 4, ………. 996, 997, 998, 999, 1000

From the outsides inwards we add

1+ 1000 = 1001

Then we add 2 + 999 = 1001

Next we add 3 + 998 = 1001

………

That is, every time we make a sum like this, we will always have 1001.

How many sums will have to be made? Only 500 sums.

So, if we multiply 1001 five hundred times:

We will have: 500 x 1001 = 500500

[This is how Gauss did it for the first hundred numbers]