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Sum of Consecutive Numbers

The sum of fi...

Question

The sum of first 6 natural numbers is .

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Solution

The correct option is A 21
Sum of first n natural numbers = $\frac{n (n + 1)}{2}$
= $\frac{6 (6 + 1)}{2}$
= $\frac{6 \times 7}{2}$
= $3 \times 7$ = 21
$∴$ The sum of first 6 natural numbers is 21.

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