Question

Arithmetic Progression
[CBSE
3. If 18, a, (b − 3) are in AP, then find the value of (2a - b).​

Answer 1

Step-by-step explanation:

Given: 18, a,(b−3) are in AP

So, difference between two consecutive terms is same.

a−18=b−3−a

a+a−b=−3+18

2a−b=15

Answer 2

Answer:

First term=18

second term=a

third term=(b-3)

so,a2-a1=a3-a2

a-18=b-3-a

a+a-b=(-3)+18

2a-b=15

so(2a-b)=15