Question

If 4, a, b, 28 are in Arithemetic progression then the value of ‘b’ is

Answer 1

Step-by-step explanation:

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

given a=4

4,a,b,28

a+3d = 28

4+3d = 24

d=8

b= a+2d

4+ 8*2

= 20

so b = 20