UPSKILL MATH PLUS

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Find the sum of :

(i) the first 1000 positive integers:
 
(ii) the first n positive integers:
 
Sum of the first 1000 positive integers =
 
Sum of the first n positive integers =
Answer variants:
\frac{2n(n+1)}{2}
\frac{n(n+1)}{2}
\frac{n(n-1)}{2}