The sum of first $20$ natural numbers is

55

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210

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110

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215

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Solution

The correct option is C $210$
The sum of first ' $n$ ' natural numbers is given by $\frac{n (n + 1)}{2}$ .
So, the sum of first $20$ natural numbers is $\frac{20 (20 + 1)}{2}$ .
$= \frac{20 (21)}{2}$
$= 210$ .

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