Question

the sum of first 20natural number is​

Answer 1

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getcalcs Arithmetic Progression (AP) calculator, formula & workout to find what is the sum of first 20 natural numbers. 210 is a sum of number series from 1 to 20 by applying the values of input parameters in the formula.

Answer 2

Answer :-

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$1,2,3,... \:,20$

a = 1

d = 1

$a_n = \: 20 \\ 1 + (n - 1)1 = 20 \\ 1 + n - 1 = 20 \\ n = 20$

$S_n = \frac{n}{2} (a + l) \\ \: \: \: \: \: \: \: \: \: = \frac{20}{2} (1 + 20) \\ = 10(21) \\ = 210$

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