Insert 4 A.M.s between 4 and 19.

Answer:

A₁, A₂, A₃, A₄ – 4 AM Between 4 and 19

4, A₁, A₂, A₃, A₄, 19 are in AP.

By using the formula,

d = (b-a) / (n+1)

d = (19 – 4) / (4 + 1)

d = 15/5

d = 3

A₁ = a + d = 4 + 3 = 7

A₂ = A1 + d = 7 + 3 = 10

A₃ = A2 + d = 10 + 3 = 13

A₄ = A3 + d = 13 + 3 = 16