Question

If 18, a, b, -3 are in Arithmetic progression, then a + b = ?​

Answer 1

Answer: The sum of a+b is 15

Step-by-step explanation:

As we have given in the question that

18, a , b, -3 make an A.P.

So according to the property of A.P.

18+(-3) = a+b

a+b=15

Answer 2

Answer:

a + b = 15

Step-by-step explanation:

Since it is an Ap,

a2 - a1 = a4 - a3

Therefore,

a - 18 = - 3 - b

= a - 18 + b = - 3

= a + b = - 3 + 18

= a + b = 15

Hope this helps you!

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