Question

sum of series: 1+2+3+............+n is
(a) n (n+1)/2 (b) n (n+1) (c) (n+1)(n+2)/2 (d) none of these
​

Answer 1

Answer:

(a) n(n+1)/2

Please mark it as brainliest

Answer 2

Answer:

option a is the answer for the given problem