Question

What is the sum of frist 20 natural number​

Answer 1

Answer:

210 is the answer

hope it helps you

Answer 2

Step-by-step explanation:

Sum of first n natural number=

$\dfrac{n \times n +1 }{2}$

Where n is the number of natural numbers (20 in this case)

$substituting \: the \: values$

$\dfrac{20 \times 20 + 1}{2} = \dfrac{20 \times 21}{2} \\ \implies \: \cancel\frac{20 \times 21}{2} = {10 \times 21 = 210}$