Question

If18,a,b,−3areinAPthenfinda+b.

Answer 1

Answer :

a + b = 15

Solution :

Given,

18, a, b, -3 are in AP

If the given series is an arithmetic progression, common difference between their consecutive terms should be equal.

→ a - 18 = -3 - b

→ a + b = -3 + 18

→ a + b = 15

Answer 2

Step-by-step explanation:

Ap is 18,a,b,-3

d = a - 18

d = -3 -b

then, a - 18 = -3 -b

a + b = 15