Question

a1,a2,a3............a11 are in ap then sigma i=1 to i=11 ai is​

Answer 1

Answer:

11a+55d

Step-by-step explanation:

Let a1=a a2=a+d............. a11=a+10d

Sigmai=1 to 11

a+a+d+a+2d+...........+a+10d

a+a+a..... 11times+(1+2+3+....+10)d

11a+10(11)/2d

11a+55d