Question

Find missing terms of. AP
__, 13, __, 3

Answer 1

x,13,y,3

common diff d=13-x=y-13=3-y

let ist and 2nd

13-x=y-13

x+y=26.........(1)

let ist and 3rd

13-x=3-y

x-y=10........(2)

now eqn 1+eqn 2

2x=26

x=13,y=13-10=5

Answer 2

Answer

Let no. be x, y

x,13,y,3

common diff d=-13-x=y-13=3-y

Let the first and second =

13-x = 3-y

x+y= 26 (1)....

Let first and third

13-x = 3-y

x-y=10 (2).....

Now eqn1+ eqn2

2x=26

x= 13,y= 13-10= 5