Question

If the sum of 3rd and 9th term of an A.P is 8 then sum of 11 terms

Answer 1

Step-by-step explanation:

Correct option is

A

44

The third term t

3

=a+3d

The ninth term t

9

=a+8d

t

3

+t

9

=2a+10d=8

Sum of first 11 terms of an AP is given by

S

11

=

2

11

[2a+10d]

S

11

=

2

11

×8=44