Question

if 4 , a , b , 28 are in the arithmetic progression then the value of 'b' is________
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Answer 1

Answer:

20

Step-by-step explanation:

a= 4 , d=? ,

for value of d :

a-4 =b-a _______ (1)

a-4 = 28-b. _______(2)

add (1 ) and (2)

2a -8 = 28 -a

3a =36

a = 12 ___________(3)

Put value of (3) in (1)

12 -4 = b -12

b=20

Answer 2

Step-by-step explanation:

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