Solve 24 ques Q.24. Find the sum of first 20 terms of the series : 1 + 1 + 2 2 + 1 + 2 + 3 3 + 1 + 2 + 3 + 4 4 + . . . . . . . . . Share with your friends Share 0 Brijendra Pal answered this Hi, The nth term of the series will be Tn= 1+2+3+...+nn=nn+12n= n+12so sum till 20 term =∑n=120n+12=12 ∑n=120n+∑n=1201=12×2020+12+20=115 0 View Full Answer
