Question

multiply (10 a+c)×2b ​

Answer 1

Answer:

As we know common difference = a2 - a1 , a3 - a2 and so on ..

AP is a, b , c

Common difference is same .

b -a = c - b

b +b = c + a

2b = c + a

2b = a + c

Hence proved !!

so 3b x 10