Question

If 18, a, (b – 3) are in AP, then find the value of (2a – b).

Answer 1

It is given that 18, a,(b-3) are in AP.

∴ a-18 = (b-3) -a

⇒ a+a-b = 18-3

⇒ 2a -b = 15

Hence, the required value is 15.