Question

find the sum of first 20 natural numbers how much more the sum of first 40 natural numbers that this?​

Answer 1

Answer:

1,2,3,4,5....,,40 are first forty natural

numbers.

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Sum of n natural numbers = sn

Sn = [ n ( n + 1 )/ 2 ]

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According to the problem,

n= 40

S40 = [ 40 ( 40 + 1 )/ 2 ]

= 20 × 41

= 820

Therefore,

Sum of first forty natural numbers

equals to 820.

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Answer 2

Step-by-step explanation:

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