Respuesta :

Sn=(a₁+an)n/2

Data:
a₁=1
an=999
n=999

Sn=(1+999)*999 /2=(1000)*999/2=999000/2=499500

Answer: the sum is 499500
Ckaranja
1+999=1000
[tex] \frac{999}{2} [/tex]
=499.5

The sum
=1000*499.5
=499500