Question

If a-1 , a-3, 3a -1 are in a A.P.then 2a = ?

8

-8

4

​

Answer 1

Answer:

-4

Step-by-step explanation:

firs term= a-1

second term= a-3

third term= 3a-1

common difference= second term-first term

                                = a-3-(a-1)=a-3-a+1=-2

Common difference= third term- second term

                                = 3a-1-(a-3)=3a-1-a+=3=2a+2

we know, common differencei same;

hence,

2a+2=-2

2a=--4