Question

le 14 : Find the sum of:
(i) the first 1000 positive integers​

Answer 1

Answer:

500,500

Step-by-step explanation:

$S_{n}$ = $\frac{n}{2}$( 2$a_{1}$ + (n - 1)d)

$S_{n}$ = $\frac{1000}{2}$ ( 2×1 + (1,000 - 1) × 1) = 500(2 + 999) = 500,500