Question

sum of first 11terms of an A.P is 44 and that of later 11 term is 55 find AP​

Answer 1

Answer:

given

S11=44

S23=55

S11= 11/2(2a+10d)=44

=2a+10d=88/11

=a+5d=8.....eq1

S23= 22/2(2a+21d)=55

=2a+21d=110/22

=2a+21d=5....eq2

by eq1 and eq2

a=13 and d= -1