Question

If 18, a, b, -3 are in A.P., then (a + b) is

Answer 1

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Step-by-step explanation:

18+1+2=21 and 1+16=17

21+17=38

Answer 2

Answer:

Step-by-step explanation:

Let p, be the first term

And d be the common different.

From given series

4th term = p+3d = -3

As, 18+3d = -3

Hence, d = -7

a= p+d = 18+(-7) = 11

b= p+2d =  18+(-14) = 4

Therefore. a+b = 11+4 = 15