if a b c are in ap then show that (b+c) (c+a) (a+b) are also in ab
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a b c are in ap
let a= 1
b= 2
c= 3
then d= 1
(b+c), (c+a), (a+ b)........
2+3, 3+1, 1+2........
= 5,4,3...........
then d= -1
hence the series are in ap.
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