Question Number 104752 by mohammad17 last updated on 23/Jul/20

Commented byqwertyu last updated on 23/Jul/20

S_n =((51+21)/2) ∙ 31 = 1116

Answered by Dwaipayan Shikari last updated on 23/Jul/20

S=21+22+.... 31 terms  S=((31)/2)(2.21+30)=31.36=1116

Commented bymohammad17 last updated on 23/Jul/20

thank you sir