Question -
Answer -
Let A1, A2,A3, A4 be the 4 AM Between 4 and 19
Then, 4, A1,A2, A3, A4, 19 are in AP.
By using the formula,
d = (b-a) / (n+1)
= (19 – 4) / (4 + 1)
= 15/5
= 3
So,
A1 = a+ d = 4 + 3 = 7
A2 =A1 + d = 7 + 3 = 10
A3 =A2 + d = 10 + 3 = 13
A4 =A3 + d = 13 + 3 = 16