What is the sum of the first n positive integers? [1 MARK]

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Solution

Formula: 0.5 Mark
Application: 0.5 Mark

$S = 1 + 2 + 3 + . . . . + n$

$S = \frac{n}{2} (f i r s t t e r m + l a s t t e r m)$

$S = \frac{n}{2} (1 + n)$

$S = \frac{n (n + 1)}{2}$

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What is the sum of the first n positive integers? [1 MARK]

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