Sum of first 1000 natural numbers

The sum of the first 1000 natural numbers can be calculated using the formula for the sum of an arithmetic series:

[

S_n = frac{n(n+1)}{2}

]

where ( n ) is the number of terms. In this case, ( n = 1000 ).

[

S_{1000} = frac{1000(1000+1)}{2} = frac{1000 times 1001}{2} = 500500

]

So, the sum of the first 1000 natural numbers is 500,500.