Question

find the sum of 1st 20 natural numbers.How much more the sum of 1st 40 natural numbers that this?​

Answer 1

Answer:

The number series 1, 2, 3, 4, . . . . , 19, 20. Therefore, 210 is the sum of positive integers upto 20.

The number series 1, 2, 3, 4, . . . . , 19, 20. Therefore, 210 is the sum of positive integers upto 20.Therefore, 820 is the sum of positive integers upto 40.

Answer 2

Answer:

Sum of 1st 20 natural no.s =210.

Step-by-step explanation:

You can just use the formula

sum of n natural no.s =n(n+1)/2

Hope this helps!