Question

If 4,a,b,28 are in Ap then value of b​

Answer 1

Answer:

a=12 and b=20

Step-by-step explanation:

4, a, b, 28 are in AP

so a-4 = b-a

2a-4=b    (1)

also last term=28, first term=4, total terms=4, common difference = a-4

so, 28=4+(4-1)(a-4)

24=3(a-4)

8=a-4

a=12

put in (1)

2(12)-4=b

b=20