Math, asked by kattasamba007, 5 months ago

find the sum of all natural numbers from 1 to 20​

Answers

Answered by adarshb800
1

Answer:

may be.......

210....

hope it helped....

Answered by AdityaBisht2004
2

Answer:

We have to find the sum n terms of the AP 1,2,3,...

Here

a=1,d=1.

Therefore, Required sum S

n

=

2

n

[2a+(n−1)d]=

2

n

[2×1+(n−1)×1]

⇒S

n

=

2

n

[2+n−1]

⇒S

n

=

2

n(n+1)

...(1)

Put n=20 in (1), we get

S

20

=

2

20(20+1)

=210

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