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:

option A

Step-by-step explanation:

using AP formula for sum:

n/2 × ( 2 + (n-1)×1) n = total no. of terms

Hope it helps... UwU