Question

in the following AP write the missing term ( ), 13, ( ), 3.​

Answer 1

As third term is three

a+2d=3

and a= 13

13+2d=3

d=-5

therefore 2nd term is = 8

Answer 2

Here,

a2=13

a4=3

Then,

a4-a2=2d

3-13=2d

-10=2d

d=-5

So,

a+d=13

a-5=13

a=13+5 = 18

Now,

AP:-

a, a+d, a+2d,a+3d,.....

=18,13,18+2(-5),3,.....

=18,13,8,3,....

Missing terms:- 18 and 8.