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Verified Answer :

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
\(\frac{999}{2}\)
=499.5

The sum
=1000*499.5
=499500

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