a,b,c are in a.p then subtract a,b,c from a+b+c. ans :- a+b+c-a , a+b+c-b , a+b+c-c. =b+c , c+a , a+b. h .p
Abhishek answered this
a , b , c are in ap
So , 2b = a+c
For b+c , c+a , a+b to be in ap u need to show that here also 2b= a+c
2(a+c) = b+c+a+b
a+c = 2b
Done..... Hope u understood , and 2b= a+c is like an identity , u can call it in ap !