Question

find the sum of first n natural numbers​

Answer 1

Sum of the First n Natural Numbers

+ n = n(n+1) / 2, for n a natural number. There is a simple applet showing the essence of the inductive proof of this result.

Answer 2

Answer:

Ap will be 1,2,3,4,..,n

a = 1

d = 1

Sn = n/2 [2a + (n-1)d]

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

= n/2 (2+n-1)

= n/2 (2-1+n)

= n/2(1+n)

Hope this helps you buddy! Please mark this answer as the brainlist answer.