Question

if 1,a,b,13 are in AP, find a and b​

Answer 1

Answer:

Step-by-step explanation:

1,a,b,3....are in A.P then,

∴common difference=13−a=3−b=b−13

⇒b−13=3−b

⇒2b=16             ∴b=8

now 13−a=3−b

⇒13−a=3−8

⇒a=18

a=18,b=8