Question

If 18,a,b,-3 are AP then value of a-b is

Answer 1

Answer:

18, a, b - 3 are in A.P.,

then a - 18 = -3 - b

⇒ a + b = -3 + 18 = 15

Step-by-step explanation:

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Answer 2

Answer:

a + b = 15

Step-by-step explanation:

18 = A..................(1)

a = A+D..............(2)

b = A+2D............(3)

-3= A+3D............(4)

On solving equation (1) and (2) ,

               we get A = 18 and D= -7

On putting the value of A and D in equation (2) and (4)

               we get a = 11 and b = 4.

So, a + b = 11 + 4 = 15.