Question

The sum of first n natural numbers is_______________
(1) n(n-1)
(2) n(n+1)/2
(3) n(n+1)
(4) n(n-1)/2​

Answer 1

Answer:

i think option four is correct

Answer 2

Answer:

The correct answer is option (2)

Step-by-step explanation:

Sum of first n natural numbers

$=1+2+3+....+n\\=\frac{n}{2}(1+n)=\frac{n(n+1)}{2}$

(Using sum of A.P. $S_n=\frac{n}{2}(a+l)$)